2A654 VOLUME 3 CDC

1. What condition will likely result from the contact of tubing with a surrounding surface?

Galling

Chafing

Scratching

Delamination

When tubing comes into contact with a surrounding surface, it can cause friction and rubbing, leading to the condition known as chafing. Chafing occurs when the tubing is continuously rubbed against another surface, causing wear and tear, and potentially leading to damage or failure of the tubing. Galling refers to the process of material transfer and adhesion between two surfaces, which is not directly related to tubing coming into contact with a surface. Scratching and delamination are also not likely conditions resulting from tubing contact with a surrounding surface.

Explanation

When tubing comes into contact with a surrounding surface, it can cause friction and rubbing, leading to the condition known as chafing. Chafing occurs when the tubing is continuously rubbed against another surface, causing wear and tear, and potentially leading to damage or failure of the tubing. Galling refers to the process of material transfer and adhesion between two surfaces, which is not directly related to tubing coming into contact with a surface. Scratching and delamination are also not likely conditions resulting from tubing contact with a surrounding surface.

2. How can you prevent damage to a screw head?

Replace screws frequently

Use correct size screwdriver

Use a chisel on overtorqued screws

Use oversized screwdriver for a snug fit

Using the correct size screwdriver is important to prevent damage to a screw head. If a screwdriver is too small or too large for the screw head, it can slip or strip the head, making it difficult to remove or tighten the screw properly. By using the correct size screwdriver, the force can be applied evenly and securely, reducing the risk of damage to the screw head.

Explanation

Using the correct size screwdriver is important to prevent damage to a screw head. If a screwdriver is too small or too large for the screw head, it can slip or strip the head, making it difficult to remove or tighten the screw properly. By using the correct size screwdriver, the force can be applied evenly and securely, reducing the risk of damage to the screw head.

3. What should you use to clean tools that are extremely greasy and grimy?

JP-4 or gasoline

MEK

Approved cleaning solvent

Aluminum oxide abrasive cloth

To clean tools that are extremely greasy and grimy, it is recommended to use an approved cleaning solvent. This is because an approved cleaning solvent is specifically designed to effectively remove grease and grime without causing damage to the tools. JP-4 or gasoline may be flammable and pose safety risks, while MEK (methyl ethyl ketone) is a strong solvent that may be too harsh for certain tools. Aluminum oxide abrasive cloth is used for abrasive cleaning and may not be suitable for removing grease and grime.

Explanation

To clean tools that are extremely greasy and grimy, it is recommended to use an approved cleaning solvent. This is because an approved cleaning solvent is specifically designed to effectively remove grease and grime without causing damage to the tools. JP-4 or gasoline may be flammable and pose safety risks, while MEK (methyl ethyl ketone) is a strong solvent that may be too harsh for certain tools. Aluminum oxide abrasive cloth is used for abrasive cleaning and may not be suitable for removing grease and grime.

4. Under what condition would an air hose be more likely to crack when bent too sharply?

During cold weather

During hot weather

Immediately after use

When the hose has collected dirt

During cold weather, the air hose is more likely to crack when bent too sharply because the cold temperatures cause the rubber to become more rigid and less flexible. This lack of flexibility makes the hose more susceptible to cracking and breaking when bent at extreme angles.

Explanation

During cold weather, the air hose is more likely to crack when bent too sharply because the cold temperatures cause the rubber to become more rigid and less flexible. This lack of flexibility makes the hose more susceptible to cracking and breaking when bent at extreme angles.

5. Why is the use of cotter pins on aircraft systems favorable?

They can be reused after removal

They are stronger than safety wire

They are less expensive than other pins

They can be removed and installed quickly

Cotter pins are favorable in aircraft systems because they can be easily removed and installed quickly. This is important in aircraft maintenance and repairs as it allows for efficient and timely replacement or adjustment of components. Additionally, quick installation and removal of cotter pins can minimize aircraft downtime and reduce maintenance costs.

Explanation

Cotter pins are favorable in aircraft systems because they can be easily removed and installed quickly. This is important in aircraft maintenance and repairs as it allows for efficient and timely replacement or adjustment of components. Additionally, quick installation and removal of cotter pins can minimize aircraft downtime and reduce maintenance costs.

6. Immediately after positioning an aircraft inside a fuel systems repair facility

The aircraft must be grounded

The aircraft must be defueled

Emergency communications must be established

Fire extinguishers must be inspected and ready for use

After positioning an aircraft inside a fuel systems repair facility, the aircraft must be grounded. Grounding an aircraft means that it is connected to the earth or a conductive surface to prevent the buildup of static electricity. This is important in a fuel systems repair facility to eliminate the risk of sparks or static discharge that could ignite fuel vapors or cause a fire. Grounding ensures the safety of the aircraft and personnel working on it.

Explanation

After positioning an aircraft inside a fuel systems repair facility, the aircraft must be grounded. Grounding an aircraft means that it is connected to the earth or a conductive surface to prevent the buildup of static electricity. This is important in a fuel systems repair facility to eliminate the risk of sparks or static discharge that could ignite fuel vapors or cause a fire. Grounding ensures the safety of the aircraft and personnel working on it.

7. Open fuel system repair areas must be equipped with a minimum of

One 150- pound Halon fire extinguisher or equivalent

Two 150- pound Halon fire extinguisher or equivalent

Thre dry chemical fire extinguishers with hose reels

Two CO2 fire extinguishers or equivalent

Open fuel system repair areas must be equipped with two 150-pound Halon fire extinguishers or equivalent. This is necessary to ensure the safety of the repair area in case of a fire. Halon fire extinguishers are specifically designed to extinguish fires involving flammable liquids, such as fuel. Having two extinguishers ensures that there is a backup in case one fails or is not sufficient to control the fire. The 150-pound capacity is necessary to provide enough extinguishing agent to effectively suppress a fire in a fuel system repair area.

Explanation

Open fuel system repair areas must be equipped with two 150-pound Halon fire extinguishers or equivalent. This is necessary to ensure the safety of the repair area in case of a fire. Halon fire extinguishers are specifically designed to extinguish fires involving flammable liquids, such as fuel. Having two extinguishers ensures that there is a backup in case one fails or is not sufficient to control the fire. The 150-pound capacity is necessary to provide enough extinguishing agent to effectively suppress a fire in a fuel system repair area.

8. What factor(s) determine the appropiate condition/ action of an integral tank fuel leak?

Location

Classification

Classification and Location

Location and repair required

The appropriate condition/action of an integral tank fuel leak is determined by both the classification and location of the leak. The classification refers to the severity or extent of the leak, while the location refers to where the leak is occurring within the integral tank. Both factors are important in determining the appropriate response or action to take in order to address and repair the fuel leak effectively.

Explanation

The appropriate condition/action of an integral tank fuel leak is determined by both the classification and location of the leak. The classification refers to the severity or extent of the leak, while the location refers to where the leak is occurring within the integral tank. Both factors are important in determining the appropriate response or action to take in order to address and repair the fuel leak effectively.

9. An authorized sealant scraper may be made from

Plastic

Copper

Titanium

Brass

An authorized sealant scraper may be made from plastic because plastic is a versatile material that is lightweight, durable, and non-corrosive. It can effectively remove sealant without causing damage to the surface being scraped. Plastic scrapers are also less likely to leave scratches or marks compared to other materials like copper, titanium, or brass. Additionally, plastic scrapers are often more affordable and readily available, making them a practical choice for sealant removal tasks.

Explanation

An authorized sealant scraper may be made from plastic because plastic is a versatile material that is lightweight, durable, and non-corrosive. It can effectively remove sealant without causing damage to the surface being scraped. Plastic scrapers are also less likely to leave scratches or marks compared to other materials like copper, titanium, or brass. Additionally, plastic scrapers are often more affordable and readily available, making them a practical choice for sealant removal tasks.

10. If you were planning to cut small quantities of replacement foam for a fuel tank, you would use

An Ontario knife

A razor blade

A hacksaw

A sticher

An Ontario knife would be the most suitable tool for cutting small quantities of replacement foam for a fuel tank. Ontario knives are known for their sharpness and precision, making them ideal for making precise and clean cuts. Using a razor blade might be too delicate and may not provide enough control, while a hacksaw would be too large and cumbersome for cutting small quantities. A sticher is not a suitable tool for cutting foam. Therefore, an Ontario knife is the best choice for this task.

Explanation

An Ontario knife would be the most suitable tool for cutting small quantities of replacement foam for a fuel tank. Ontario knives are known for their sharpness and precision, making them ideal for making precise and clean cuts. Using a razor blade might be too delicate and may not provide enough control, while a hacksaw would be too large and cumbersome for cutting small quantities. A sticher is not a suitable tool for cutting foam. Therefore, an Ontario knife is the best choice for this task.

11. What part of a Wiggins coupling provides the sealing action?

O-ring

Gasket

Snap ring

Split washer

An O-ring provides the sealing action in a Wiggins coupling. O-rings are commonly used in mechanical applications to create a seal between two parts, preventing leakage of fluids or gases. In the case of a Wiggins coupling, the O-ring is placed between the two coupling halves to create a tight seal, ensuring that no fluid or gas can escape.

Explanation

An O-ring provides the sealing action in a Wiggins coupling. O-rings are commonly used in mechanical applications to create a seal between two parts, preventing leakage of fluids or gases. In the case of a Wiggins coupling, the O-ring is placed between the two coupling halves to create a tight seal, ensuring that no fluid or gas can escape.

12. Who orders evacuation of a fuel tank in the event of an emergency situation?

Entrant

Attendant

Entry authority

Equipment monitor/ runner

The correct answer is Attendant. In the event of an emergency situation, the attendant is responsible for ordering the evacuation of a fuel tank. As the person in charge of overseeing the fuel tank operation, the attendant has the knowledge and authority to make decisions regarding safety protocols and evacuation procedures. They are trained to assess the situation, identify potential risks, and take appropriate actions to ensure the safety of everyone involved.

Explanation

The correct answer is Attendant. In the event of an emergency situation, the attendant is responsible for ordering the evacuation of a fuel tank. As the person in charge of overseeing the fuel tank operation, the attendant has the knowledge and authority to make decisions regarding safety protocols and evacuation procedures. They are trained to assess the situation, identify potential risks, and take appropriate actions to ensure the safety of everyone involved.

13. Which of the following changed conditions would requiere amendment of an entry permit by the entry authority?

The task takes a few days longer than expected

Authorized chemicals are brought into the tank

The aircraft is moved from one repair location to another

Previously permitted personnel require re-entry into the tank

When the aircraft is moved from one repair location to another, it would require an amendment of the entry permit by the entry authority. This is because the change in repair location could affect the safety and security protocols, as well as the permissions and clearances needed for the entry and repair process. Therefore, the entry authority needs to update the entry permit to ensure that all necessary requirements and conditions are met for the new repair location.

Explanation

When the aircraft is moved from one repair location to another, it would require an amendment of the entry permit by the entry authority. This is because the change in repair location could affect the safety and security protocols, as well as the permissions and clearances needed for the entry and repair process. Therefore, the entry authority needs to update the entry permit to ensure that all necessary requirements and conditions are met for the new repair location.

14. What minimum diameter safety wire should be installed on bolts having a .050-inch drilled hole?

.032

.020

.045

.028

The minimum diameter safety wire that should be installed on bolts with a .050-inch drilled hole is .032. This means that the wire should have a diameter of .032 inches in order to properly secure the bolts.

Explanation

The minimum diameter safety wire that should be installed on bolts with a .050-inch drilled hole is .032. This means that the wire should have a diameter of .032 inches in order to properly secure the bolts.

15. An aircraft in a fuel systems hangar is being blow-purged. The aircraft does not contain foam. As a minimum, how often must a lower explosive limit (LEL) reading be taken?

Every four hours

Every eight hours

At the beginning of each shift

At the beginning of the workday

In a fuel systems hangar, blow-purging is a process used to remove flammable vapors or gases from the aircraft. Since the aircraft does not contain foam, there is a potential risk of explosive conditions due to the presence of fuel vapors. Therefore, it is necessary to monitor the lower explosive limit (LEL) regularly to ensure the safety of the hangar and personnel. Taking LEL readings every four hours allows for timely detection of any potential buildup of flammable vapors, enabling prompt action to prevent an explosion or fire hazard.

Explanation

In a fuel systems hangar, blow-purging is a process used to remove flammable vapors or gases from the aircraft. Since the aircraft does not contain foam, there is a potential risk of explosive conditions due to the presence of fuel vapors. Therefore, it is necessary to monitor the lower explosive limit (LEL) regularly to ensure the safety of the hangar and personnel. Taking LEL readings every four hours allows for timely detection of any potential buildup of flammable vapors, enabling prompt action to prevent an explosion or fire hazard.

16. Which type of wrench should you use to tighten an internal wrenching nut?

Socket

Adjustable jaw

Allen

Recessed

An internal wrenching nut typically has a hexagonal shape, which means it requires a wrench with a corresponding hexagonal shape to tighten it properly. An Allen wrench, also known as a hex key or hex wrench, is designed specifically for this purpose. It has a hexagonal-shaped end that fits into the nut's hexagonal recess, allowing for effective tightening. Therefore, an Allen wrench is the appropriate tool to use in this situation.

Explanation

An internal wrenching nut typically has a hexagonal shape, which means it requires a wrench with a corresponding hexagonal shape to tighten it properly. An Allen wrench, also known as a hex key or hex wrench, is designed specifically for this purpose. It has a hexagonal-shaped end that fits into the nut's hexagonal recess, allowing for effective tightening. Therefore, an Allen wrench is the appropriate tool to use in this situation.

17. The temperature range of the HDU-13/M heater is

0 to 170 F

20 to 180 F

30 to 190 F

40 to 200 F

The correct answer is 40 to 200 F. This means that the temperature range of the HDU-13/M heater is from a minimum of 40 degrees Fahrenheit to a maximum of 200 degrees Fahrenheit.

Explanation

The correct answer is 40 to 200 F. This means that the temperature range of the HDU-13/M heater is from a minimum of 40 degrees Fahrenheit to a maximum of 200 degrees Fahrenheit.

18. Which maintenance stand is not adjustable?

C-1

B-1

B-5

B-2

The correct answer is C-1. This maintenance stand is not adjustable because it is specifically designed to be fixed at a certain height or position. Unlike the other options, C-1 does not have any adjustable features or mechanisms that allow for height or position adjustments.

Explanation

The correct answer is C-1. This maintenance stand is not adjustable because it is specifically designed to be fixed at a certain height or position. Unlike the other options, C-1 does not have any adjustable features or mechanisms that allow for height or position adjustments.

19. Structural support members of an integral tank should never be removed until

It is time to perform maintenance

The load stress has been removed

Replacement fasteners have been found

Permission has been given by the system manager

The structural support members of an integral tank should never be removed until the load stress has been removed. This is because the load stress puts pressure on the support members, and removing them before the stress is relieved can lead to structural failure or collapse. It is important to ensure that the tank is stable and the load stress is no longer present before removing any support members for maintenance or other purposes.

Explanation

The structural support members of an integral tank should never be removed until the load stress has been removed. This is because the load stress puts pressure on the support members, and removing them before the stress is relieved can lead to structural failure or collapse. It is important to ensure that the tank is stable and the load stress is no longer present before removing any support members for maintenance or other purposes.

20. A noncuring sealant design is made up of

Voids and gaps

Grooves and channels

Stringers and braces

Fasteners and baffles

A noncuring sealant design is made up of grooves and channels. Grooves and channels are used to create a pathway for the sealant to flow and fill in voids and gaps. By having grooves and channels, the sealant can be applied more evenly and effectively, ensuring that all areas are properly sealed. This design allows for better adhesion and prevents any leaks or gaps from forming, providing a reliable and durable seal.

Explanation

A noncuring sealant design is made up of grooves and channels. Grooves and channels are used to create a pathway for the sealant to flow and fill in voids and gaps. By having grooves and channels, the sealant can be applied more evenly and effectively, ensuring that all areas are properly sealed. This design allows for better adhesion and prevents any leaks or gaps from forming, providing a reliable and durable seal.

21. Which is a feature of a T-handle type torque qrench?

Is difficult to use

Can be adjusted in small increments

Has a preset torque

Can possibly over-tighten a fastener

A T-handle type torque wrench has a preset torque, meaning that it is designed to tighten a fastener to a specific torque value. This feature ensures that the fastener is tightened to the correct level, preventing under or over-tightening. The preset torque allows for precise and consistent tightening, making it a reliable tool for various applications.

Explanation

A T-handle type torque wrench has a preset torque, meaning that it is designed to tighten a fastener to a specific torque value. This feature ensures that the fastener is tightened to the correct level, preventing under or over-tightening. The preset torque allows for precise and consistent tightening, making it a reliable tool for various applications.

22. Which tool is used to repair a fuel cell fitting?

Air chisel

Bench grinder

Torque wrench

Pneumatic buffer

A pneumatic buffer is a tool used to repair a fuel cell fitting. It is a type of power tool that uses compressed air to rotate a buffing wheel or pad. This tool is commonly used in automotive and industrial applications to smooth and polish surfaces. In the context of repairing a fuel cell fitting, a pneumatic buffer can be used to remove any imperfections or corrosion on the fitting, ensuring a proper seal and preventing leaks.

Explanation

A pneumatic buffer is a tool used to repair a fuel cell fitting. It is a type of power tool that uses compressed air to rotate a buffing wheel or pad. This tool is commonly used in automotive and industrial applications to smooth and polish surfaces. In the context of repairing a fuel cell fitting, a pneumatic buffer can be used to remove any imperfections or corrosion on the fitting, ensuring a proper seal and preventing leaks.

23. For what purpose is the AFTO form 427 used

Historical records of leak repairs

Temporary record of temporary repairs

Temporary record of permanent repairs

Historical record of component changes

The AFTO form 427 is used for the purpose of maintaining historical records of leak repairs. This form is specifically designed to document any repairs made to address leaks in various components or systems. By keeping track of these repairs, it allows for easy reference and analysis of past issues, helping to identify patterns, trends, and potential areas for improvement in the future.

Explanation

The AFTO form 427 is used for the purpose of maintaining historical records of leak repairs. This form is specifically designed to document any repairs made to address leaks in various components or systems. By keeping track of these repairs, it allows for easy reference and analysis of past issues, helping to identify patterns, trends, and potential areas for improvement in the future.

24. When should the hollow bolt method be used to isolate a leak source in an integral tank?

When the double cup assembly was unsuccessful

When the leak is at a common tank boundary

Any time the leak is larger then class A

In conjuction with the pressure box

The hollow bolt method should be used to isolate a leak source in an integral tank when the double cup assembly was unsuccessful. This means that if the double cup assembly, which is a common method for sealing leaks, did not work, then the hollow bolt method can be used as an alternative. It is a technique that involves using a hollow bolt to seal the leak and prevent any further leakage.

Explanation

The hollow bolt method should be used to isolate a leak source in an integral tank when the double cup assembly was unsuccessful. This means that if the double cup assembly, which is a common method for sealing leaks, did not work, then the hollow bolt method can be used as an alternative. It is a technique that involves using a hollow bolt to seal the leak and prevent any further leakage.

25. A brush coat of sealant should be applied with?

Spatula

Acid brush

Paint brush

Fairing tool

An acid brush should be used to apply a brush coat of sealant. Acid brushes are typically made of natural bristles and have a wooden handle. They are commonly used for applying acids, solvents, and other liquids. The bristles of an acid brush are firm and can hold a good amount of sealant, allowing for precise and controlled application. The brush coat of sealant helps to create a protective barrier and ensure proper adhesion of the sealant to the surface.

Explanation

An acid brush should be used to apply a brush coat of sealant. Acid brushes are typically made of natural bristles and have a wooden handle. They are commonly used for applying acids, solvents, and other liquids. The bristles of an acid brush are firm and can hold a good amount of sealant, allowing for precise and controlled application. The brush coat of sealant helps to create a protective barrier and ensure proper adhesion of the sealant to the surface.

26. The size of a bolt is generally stated in terms of its

Weight, diameter, and head size

Head size, grip length, and weight

Length, weight, and threads per inch

Diameter, length, and threads per inch

The size of a bolt is generally stated in terms of its diameter, length, and threads per inch. These three factors are important in determining the compatibility and functionality of the bolt. The diameter refers to the thickness of the bolt, the length determines how far the bolt extends, and the threads per inch indicate the number of threads present on the bolt. Together, these measurements provide a comprehensive understanding of the bolt's size and specifications.

Explanation

The size of a bolt is generally stated in terms of its diameter, length, and threads per inch. These three factors are important in determining the compatibility and functionality of the bolt. The diameter refers to the thickness of the bolt, the length determines how far the bolt extends, and the threads per inch indicate the number of threads present on the bolt. Together, these measurements provide a comprehensive understanding of the bolt's size and specifications.

27. What type of manifold coupling consists of a body, nut, split washers, o-rings, and a retainer?

V-band

Pneumatic

Wiggins

Quick-disconnect

A Wiggins manifold coupling consists of a body, nut, split washers, o-rings, and a retainer. This type of coupling is commonly used in various industries, including automotive and aerospace, to provide a secure and leak-free connection between two components. The split washers and o-rings help to create a tight seal, while the retainer ensures that the coupling remains securely fastened. Wiggins couplings are known for their reliability and ease of use, making them a popular choice in many applications.

Explanation

A Wiggins manifold coupling consists of a body, nut, split washers, o-rings, and a retainer. This type of coupling is commonly used in various industries, including automotive and aerospace, to provide a secure and leak-free connection between two components. The split washers and o-rings help to create a tight seal, while the retainer ensures that the coupling remains securely fastened. Wiggins couplings are known for their reliability and ease of use, making them a popular choice in many applications.

28. Maintenance stands useed specially for fuel system maintenance should be equipped with

Static discharge plates

Static discharge plates and handrail steps

Wheel locks and bonding wire reels

Handrail steps and wheel locks

Maintenance stands used specifically for fuel system maintenance should be equipped with static discharge plates. These plates help to safely dissipate any static electricity that may be present, reducing the risk of sparks or ignition in a potentially flammable environment. By providing a path for static electricity to discharge, these plates help to ensure the safety of both the maintenance personnel and the equipment being worked on.

Explanation

Maintenance stands used specifically for fuel system maintenance should be equipped with static discharge plates. These plates help to safely dissipate any static electricity that may be present, reducing the risk of sparks or ignition in a potentially flammable environment. By providing a path for static electricity to discharge, these plates help to ensure the safety of both the maintenance personnel and the equipment being worked on.

29. An air compressor operating outside the fuel system repair area

Must be bonded

Must be grounded

Must be grounded and bonded

Does not require grounding and bonding

The correct answer is "does not require grounding and bonding." This is because an air compressor operating outside the fuel system repair area does not pose a significant risk of igniting flammable vapors, so it does not need to be grounded or bonded. Grounding and bonding are typically required for electrical equipment in areas where there is a higher risk of sparks or static electricity causing a fire or explosion. However, since the air compressor is operating outside the fuel system repair area, it is considered safe and does not require grounding or bonding.

Explanation

The correct answer is "does not require grounding and bonding." This is because an air compressor operating outside the fuel system repair area does not pose a significant risk of igniting flammable vapors, so it does not need to be grounded or bonded. Grounding and bonding are typically required for electrical equipment in areas where there is a higher risk of sparks or static electricity causing a fire or explosion. However, since the air compressor is operating outside the fuel system repair area, it is considered safe and does not require grounding or bonding.

30. For which of the following aircraft applications should a self-locking nut not be installed?

Attachment of a pulley

Attachment of an antifriction bearing

Mounting an accessory near the engine

Connecting sections of a movable joint

A self-locking nut should not be installed for connecting sections of a movable joint because these joints require the ability to move and adjust. A self-locking nut would prevent this movement and could cause damage or failure of the joint.

Explanation

A self-locking nut should not be installed for connecting sections of a movable joint because these joints require the ability to move and adjust. A self-locking nut would prevent this movement and could cause damage or failure of the joint.

31. The ratio of output pressure to input pressure of a two-part sealant high-pressure injection gun is

10 to 1

25 to 1

50 to 1

125 to 1

The ratio of output pressure to input pressure of a two-part sealant high-pressure injection gun is 50 to 1. This means that for every unit of input pressure, the gun produces 50 units of output pressure. This high ratio indicates that the gun is capable of generating a significant amount of pressure, making it suitable for applications that require a strong sealant bond.

Explanation

The ratio of output pressure to input pressure of a two-part sealant high-pressure injection gun is 50 to 1. This means that for every unit of input pressure, the gun produces 50 units of output pressure. This high ratio indicates that the gun is capable of generating a significant amount of pressure, making it suitable for applications that require a strong sealant bond.

32. Which assembly includes the aft end of the fuselage of conventionally designed aircraft?

Fairing

Ailerons

Empennage

Trailing edge

The empennage is the assembly that includes the aft end of the fuselage of conventionally designed aircraft. It typically consists of the horizontal stabilizer, vertical stabilizer, and control surfaces such as the rudder and elevator. The empennage plays a crucial role in providing stability and control to the aircraft during flight. The other options, fairing, ailerons, and trailing edge, do not specifically refer to the aft end of the fuselage.

Explanation

The empennage is the assembly that includes the aft end of the fuselage of conventionally designed aircraft. It typically consists of the horizontal stabilizer, vertical stabilizer, and control surfaces such as the rudder and elevator. The empennage plays a crucial role in providing stability and control to the aircraft during flight. The other options, fairing, ailerons, and trailing edge, do not specifically refer to the aft end of the fuselage.

33. Which type of rivet is used on the top skin surface of an aircraft?

Flathead

Countersunk

Roundhead

Brazier head

Countersunk rivets are used on the top skin surface of an aircraft. These rivets have a conical shape with a flat head that sits flush with the surface, creating a smooth and aerodynamic surface. The countersunk shape allows the rivet to be recessed into the material, reducing drag and preventing interference with airflow over the aircraft's surface. This type of rivet is commonly used in aviation to ensure optimal aerodynamic performance and structural integrity.

Explanation

Countersunk rivets are used on the top skin surface of an aircraft. These rivets have a conical shape with a flat head that sits flush with the surface, creating a smooth and aerodynamic surface. The countersunk shape allows the rivet to be recessed into the material, reducing drag and preventing interference with airflow over the aircraft's surface. This type of rivet is commonly used in aviation to ensure optimal aerodynamic performance and structural integrity.

34. Which example is not acceptable regarding the installation of a flexible hose assembly?

Install the hose so that it will not be subjected to twisting

Use oil to aid the installation of a self-sealing hose

Ensure clamps are not so tight that they restrict flow

Support the hose at least every 24 inches of length

Using oil to aid the installation of a self-sealing hose is not an acceptable example. The use of oil can potentially compromise the integrity of the hose and cause it to leak or fail. It is important to follow the manufacturer's guidelines and recommendations for the installation of flexible hose assemblies to ensure proper functioning and safety.

Explanation

Using oil to aid the installation of a self-sealing hose is not an acceptable example. The use of oil can potentially compromise the integrity of the hose and cause it to leak or fail. It is important to follow the manufacturer's guidelines and recommendations for the installation of flexible hose assemblies to ensure proper functioning and safety.

35. The display on the T477W bonding meter is turned on by pressing the

TEST button

START buttong

ILLUMINATE button

LIGHT button

The display on the T477W bonding meter is turned on by pressing the TEST button.

Explanation

The display on the T477W bonding meter is turned on by pressing the TEST button.

36. The injection of noncuring sealant on aircraft is generally limited to areas

Where corrosion is likely to develop

Which are exposed to the elements

Where structural loading occurs

Where access is difficult

The injection of noncuring sealant on aircraft is generally limited to areas where access is difficult. This is because noncuring sealant is typically used to prevent or repair leaks in areas that are hard to reach or inaccessible. It is applied in areas where traditional sealing methods may not be effective or practical due to limited access. By injecting the sealant into these difficult-to-reach areas, it ensures that the aircraft remains properly sealed and protected from potential leaks or corrosion.

Explanation

The injection of noncuring sealant on aircraft is generally limited to areas where access is difficult. This is because noncuring sealant is typically used to prevent or repair leaks in areas that are hard to reach or inaccessible. It is applied in areas where traditional sealing methods may not be effective or practical due to limited access. By injecting the sealant into these difficult-to-reach areas, it ensures that the aircraft remains properly sealed and protected from potential leaks or corrosion.

37. What type of tubing is used in high-pressure systems such as the landing gear system?

Copper

Stainless steel

Titanium alloy

Aluminum alloy

Stainless steel is used in high-pressure systems such as the landing gear system because it has excellent corrosion resistance and can withstand high pressure and temperature conditions. It is also strong and durable, making it suitable for the demanding requirements of high-pressure systems. Copper, titanium alloy, and aluminum alloy may not have the same level of corrosion resistance and strength as stainless steel, making them less suitable for high-pressure systems.

Explanation

Stainless steel is used in high-pressure systems such as the landing gear system because it has excellent corrosion resistance and can withstand high pressure and temperature conditions. It is also strong and durable, making it suitable for the demanding requirements of high-pressure systems. Copper, titanium alloy, and aluminum alloy may not have the same level of corrosion resistance and strength as stainless steel, making them less suitable for high-pressure systems.

38. Which support equipment item is equipped with a 110-volt AC power receptacle to permit the use of electrical equipment outside the repair area

NF-2 light-all

MB-2 nitrogen cart

DIesel Generator

HDU-13/M heater

The NF-2 light-all is equipped with a 110-volt AC power receptacle to allow the use of electrical equipment outside the repair area. This suggests that the NF-2 light-all is designed to provide portable lighting and power sources for tasks that require electricity in areas where it may not be readily available.

Explanation

The NF-2 light-all is equipped with a 110-volt AC power receptacle to allow the use of electrical equipment outside the repair area. This suggests that the NF-2 light-all is designed to provide portable lighting and power sources for tasks that require electricity in areas where it may not be readily available.

39. Which of the follwoing would be allowed to operate inside the open fuel system repair area?

Air purifier cart, HDU/13 heater, or BT-400 heater

Defueling truck, tow vehicle, or MA-1 blower

AGE tractor, BT-400 heater, or MA-1 blower

Air purifier cart, HDU/13 hearter, or MA-1 blower

The air purifier cart, HDU/13 heater, and MA-1 blower would be allowed to operate inside the open fuel system repair area.

Explanation

The air purifier cart, HDU/13 heater, and MA-1 blower would be allowed to operate inside the open fuel system repair area.

40. Which of the following are examples of secondary flight controls?

Ailerons

Rudders

Trim tabs

Elevators

Secondary flight controls are devices that are used to assist in controlling the aircraft's movement and stability. Ailerons, rudders, and elevators are primary flight controls, as they directly control the aircraft's roll, yaw, and pitch respectively. Trim tabs, on the other hand, are secondary flight controls. They are small surfaces attached to the primary flight controls and are used to fine-tune the aircraft's trim or balance during flight. By adjusting the trim tabs, pilots can reduce control forces and maintain the desired attitude of the aircraft, improving overall control and stability.

Explanation

Secondary flight controls are devices that are used to assist in controlling the aircraft's movement and stability. Ailerons, rudders, and elevators are primary flight controls, as they directly control the aircraft's roll, yaw, and pitch respectively. Trim tabs, on the other hand, are secondary flight controls. They are small surfaces attached to the primary flight controls and are used to fine-tune the aircraft's trim or balance during flight. By adjusting the trim tabs, pilots can reduce control forces and maintain the desired attitude of the aircraft, improving overall control and stability.

41. What powered tool is often used to remove access door screws?

Impact wrench

Speed handle

Air hammer

Electric drill with adapter

An impact wrench is often used to remove access door screws because it provides a high torque output that allows for quick and efficient removal of screws. It is designed to deliver strong rotational force, making it ideal for tasks that require a lot of power. This tool is commonly used in automotive and construction industries where there is a need to remove screws quickly and easily.

Explanation

An impact wrench is often used to remove access door screws because it provides a high torque output that allows for quick and efficient removal of screws. It is designed to deliver strong rotational force, making it ideal for tasks that require a lot of power. This tool is commonly used in automotive and construction industries where there is a need to remove screws quickly and easily.

42. The one-part sealant gun is used to inject sealant into

Prepacks

Loose rivet holes

Voids inside the tank

Channels under the wing skin

The one-part sealant gun is used to inject sealant into channels under the wing skin. This is likely because channels under the wing skin can be difficult to access and seal manually, so a sealant gun is used to inject the sealant directly into these channels. This ensures a proper and thorough seal, preventing any leaks or damage to the wing structure.

Explanation

The one-part sealant gun is used to inject sealant into channels under the wing skin. This is likely because channels under the wing skin can be difficult to access and seal manually, so a sealant gun is used to inject the sealant directly into these channels. This ensures a proper and thorough seal, preventing any leaks or damage to the wing structure.

43. You should not apply sealant to an aircraft surface if the temperature is less than

70 F

60 F

55 F

50 F

Sealant should not be applied to an aircraft surface if the temperature is less than 60 F. This is because sealants require a certain temperature range to properly cure and adhere to the surface. If the temperature is too low, the sealant may not cure properly and may not provide the necessary protection and sealing properties. Applying sealant at temperatures below the recommended range can lead to ineffective sealing and potential damage to the aircraft.

Explanation

Sealant should not be applied to an aircraft surface if the temperature is less than 60 F. This is because sealants require a certain temperature range to properly cure and adhere to the surface. If the temperature is too low, the sealant may not cure properly and may not provide the necessary protection and sealing properties. Applying sealant at temperatures below the recommended range can lead to ineffective sealing and potential damage to the aircraft.

44. Which flight control surface controls the directional movement about the axis of an aircraft?

Critical

Primary

Auxiliary

Secondary

The primary flight control surface that controls the directional movement about the axis of an aircraft is the rudder. The rudder is located on the vertical stabilizer of the aircraft and is used to control the yawing motion of the aircraft. By deflecting the rudder, the pilot can make the aircraft turn left or right. The other options, critical, auxiliary, and secondary, are not specifically related to the control of directional movement.

Explanation

The primary flight control surface that controls the directional movement about the axis of an aircraft is the rudder. The rudder is located on the vertical stabilizer of the aircraft and is used to control the yawing motion of the aircraft. By deflecting the rudder, the pilot can make the aircraft turn left or right. The other options, critical, auxiliary, and secondary, are not specifically related to the control of directional movement.

45. Which type of tubing defect would be considered acceptable?

A dent measuring 35% of the tubing diameter

Several nicks measuring 15% of the tubing wall thickness

A scratch that measures 25% of the tubing wall thickness

A dent on the heel of a bend with less than the recommended radius

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Explanation

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46. Moderate corrosion is normally removed from an aircraft surface by

Light hand scrubbing

Scrubbing with steel wool

Light mechanical sanding

Brushing with a steel wire brush

Moderate corrosion on an aircraft surface is typically removed by light mechanical sanding. This process involves using sandpaper or a similar abrasive material to gently remove the corroded layer, without causing damage to the underlying surface. Light hand scrubbing, scrubbing with steel wool, and brushing with a steel wire brush may be too aggressive and could potentially cause further damage to the aircraft surface. Therefore, light mechanical sanding is the most appropriate method for removing moderate corrosion.

Explanation

Moderate corrosion on an aircraft surface is typically removed by light mechanical sanding. This process involves using sandpaper or a similar abrasive material to gently remove the corroded layer, without causing damage to the underlying surface. Light hand scrubbing, scrubbing with steel wool, and brushing with a steel wire brush may be too aggressive and could potentially cause further damage to the aircraft surface. Therefore, light mechanical sanding is the most appropriate method for removing moderate corrosion.

47. Which maintenance stand can easily be moved by one person?

B-1

B-2

C-1

Mainlift

The maintenance stand that can easily be moved by one person is C-1.

Explanation

The maintenance stand that can easily be moved by one person is C-1.

48. Mixed sealant should be discared when it

Will not wet the surface

Is uniform in color

Has a strong odor

Flows too easily

When a mixed sealant will not wet the surface, it means that it is not able to spread evenly and adhere properly to the surface it is being applied to. This can be due to various reasons such as the wrong consistency or improper mixing of the sealant. In such cases, the sealant will not be effective in creating a proper seal and should be discarded.

Explanation

When a mixed sealant will not wet the surface, it means that it is not able to spread evenly and adhere properly to the surface it is being applied to. This can be due to various reasons such as the wrong consistency or improper mixing of the sealant. In such cases, the sealant will not be effective in creating a proper seal and should be discarded.

49. Which type of attachment should you use on the fuel cell pneumatic buffer to buff bladder cells and flanges?

Buffing arbor

Buffing pad

Buffing band

Buffing stone

A buffing stone is the appropriate attachment to use on the fuel cell pneumatic buffer for buffing bladder cells and flanges. A buffing stone is a hard abrasive stone that is capable of removing surface imperfections and smoothing out rough areas. It is commonly used in automotive and aerospace industries for polishing and finishing metal surfaces. The other options, such as buffing arbor, buffing pad, and buffing band, are not suitable for buffing bladder cells and flanges.

Explanation

A buffing stone is the appropriate attachment to use on the fuel cell pneumatic buffer for buffing bladder cells and flanges. A buffing stone is a hard abrasive stone that is capable of removing surface imperfections and smoothing out rough areas. It is commonly used in automotive and aerospace industries for polishing and finishing metal surfaces. The other options, such as buffing arbor, buffing pad, and buffing band, are not suitable for buffing bladder cells and flanges.

50. All "hot work" performed on an aircraft in a fuel systems repair facility must be approved by the

Maintenance group commander

Ground safety office

Fuel tank entry chief

Fire department

"Hot work" refers to any work that involves the use of open flames, sparks, or heat-producing tools, which can pose a fire hazard. In an aircraft fuel systems repair facility, where fuel is present, it is crucial to ensure that all hot work is approved by the fire department. The fire department has the expertise and resources to assess the potential fire risks and implement necessary safety measures, such as fire suppression systems and fire extinguishers, to prevent accidents and protect the aircraft and personnel from fire hazards.

Explanation

"Hot work" refers to any work that involves the use of open flames, sparks, or heat-producing tools, which can pose a fire hazard. In an aircraft fuel systems repair facility, where fuel is present, it is crucial to ensure that all hot work is approved by the fire department. The fire department has the expertise and resources to assess the potential fire risks and implement necessary safety measures, such as fire suppression systems and fire extinguishers, to prevent accidents and protect the aircraft and personnel from fire hazards.

51. When you use the water manometer, you should

Relieve tan pressure by disconnecting the manometer hose

Ensure that the amnometer safety relief valves are calibrated

Unplug the negative pressure connection when the fuel tank is given a positive test.

Ensure the positive pressure connection is plugged when the fuel tank is under negative pressure

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Explanation

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52. Which of the following atmospheric conditions are considered "entry-safe" in a fuel tank without foam

10 percent LEL

12 percent LEL

16 percent LEL

20 percent LEL

A fuel tank without foam is considered "entry-safe" when the atmospheric condition inside the tank is at 10 percent LEL (Lower Explosive Limit). LEL refers to the minimum concentration of a flammable substance in the air that can ignite. A lower LEL indicates a safer environment as it means there is a lower risk of an explosion or fire. Therefore, a 10 percent LEL is considered safe for entry into a fuel tank without foam.

Explanation

A fuel tank without foam is considered "entry-safe" when the atmospheric condition inside the tank is at 10 percent LEL (Lower Explosive Limit). LEL refers to the minimum concentration of a flammable substance in the air that can ignite. A lower LEL indicates a safer environment as it means there is a lower risk of an explosion or fire. Therefore, a 10 percent LEL is considered safe for entry into a fuel tank without foam.

53. Which situation describes an ideal installation of a bolt on an aircraft component?

The grip length of the bolt is slightly shorter than the thickness of the materials being joined.

The grip length of the bolt is the same as the thickness of the materials being joined.

The grip length of the bolt is is slightly longer than the thickness of the materials being joined.

The grip length of the bolt is much longer than the thickness of the materials being joined.

In an ideal installation of a bolt on an aircraft component, the grip length of the bolt should be slightly shorter than the thickness of the materials being joined. This ensures that the bolt provides a secure and tight connection between the materials without protruding too far, which could cause interference or damage. Having the grip length slightly shorter also allows for proper tensioning of the bolt, ensuring that it can withstand the forces and vibrations experienced during aircraft operation.

Explanation

In an ideal installation of a bolt on an aircraft component, the grip length of the bolt should be slightly shorter than the thickness of the materials being joined. This ensures that the bolt provides a secure and tight connection between the materials without protruding too far, which could cause interference or damage. Having the grip length slightly shorter also allows for proper tensioning of the bolt, ensuring that it can withstand the forces and vibrations experienced during aircraft operation.

54. Which area may be a prime location for fungus growth because of condensational buildup?

Fuel manifold

Landing area

Integral tank

Exhaust ducting

The integral tank may be a prime location for fungus growth because of condensational buildup. Condensation occurs when warm air comes into contact with a cold surface, causing moisture to form. In an integral tank, there may be areas where moisture can accumulate, such as corners or crevices. This moisture, combined with the dark and stagnant environment of the tank, creates a favorable condition for fungus to grow.

Explanation

The integral tank may be a prime location for fungus growth because of condensational buildup. Condensation occurs when warm air comes into contact with a cold surface, causing moisture to form. In an integral tank, there may be areas where moisture can accumulate, such as corners or crevices. This moisture, combined with the dark and stagnant environment of the tank, creates a favorable condition for fungus to grow.

55. Which material should never be used to make a sealant scraper?

Phenolic block

Aluminum

Hardwood

Brass

Brass should never be used to make a sealant scraper because it is a relatively soft material compared to other options like phenolic block, aluminum, and hardwood. The purpose of a sealant scraper is to effectively remove sealant or adhesive residue from surfaces, and a soft material like brass would not be able to provide the necessary strength and durability for this task. It could easily wear down or deform, making it ineffective for scraping. Therefore, brass is not a suitable material for a sealant scraper.

Explanation

Brass should never be used to make a sealant scraper because it is a relatively soft material compared to other options like phenolic block, aluminum, and hardwood. The purpose of a sealant scraper is to effectively remove sealant or adhesive residue from surfaces, and a soft material like brass would not be able to provide the necessary strength and durability for this task. It could easily wear down or deform, making it ineffective for scraping. Therefore, brass is not a suitable material for a sealant scraper.

56. Where should you position the fuel cell/tank servicing cart?

Near the MA-1 blower

Beside the HDU/13 heater

Inside the fuel system repair area

At least 10 feet from any vent or other tank opening

The fuel cell/tank servicing cart should be positioned inside the fuel system repair area. This ensures that it is easily accessible and in close proximity to the fuel system, allowing for efficient and convenient servicing of the fuel cell/tank. Placing it inside the repair area also helps to maintain a clean and organized workspace for fuel system repairs.

Explanation

The fuel cell/tank servicing cart should be positioned inside the fuel system repair area. This ensures that it is easily accessible and in close proximity to the fuel system, allowing for efficient and convenient servicing of the fuel cell/tank. Placing it inside the repair area also helps to maintain a clean and organized workspace for fuel system repairs.

57. The stringers in an integral tank

Strengthen the spars

Give shape to the wing

Are primary structural members

Provide attachment points for the skin

The stringers in an integral tank provide attachment points for the skin. This means that they are responsible for connecting and securing the outer layer of the tank, ensuring that it remains in place and maintains its shape. Without the stringers, the skin would not have a solid foundation to be attached to, and the tank would not be structurally sound. Therefore, the stringers play a crucial role in providing support and stability to the tank's overall structure.

Explanation

The stringers in an integral tank provide attachment points for the skin. This means that they are responsible for connecting and securing the outer layer of the tank, ensuring that it remains in place and maintains its shape. Without the stringers, the skin would not have a solid foundation to be attached to, and the tank would not be structurally sound. Therefore, the stringers play a crucial role in providing support and stability to the tank's overall structure.

58. Which of the following conditions will cause a container of unmixed liquid base or accelerator sealant to be unserviceable?

Skinning

Uniform color

Strong aroma

Glossy appearance

Skinning refers to the formation of a skin or crust on the surface of the liquid sealant. This can occur when the sealant is exposed to air for a prolonged period, causing it to dry and harden on the surface. Skinning makes the sealant unserviceable because it affects the consistency and usability of the product. It becomes difficult to mix and apply the sealant properly when a skin has formed, leading to compromised sealing performance. Therefore, a container of unmixed liquid base or accelerator sealant with skinning is considered unserviceable.

Explanation

Skinning refers to the formation of a skin or crust on the surface of the liquid sealant. This can occur when the sealant is exposed to air for a prolonged period, causing it to dry and harden on the surface. Skinning makes the sealant unserviceable because it affects the consistency and usability of the product. It becomes difficult to mix and apply the sealant properly when a skin has formed, leading to compromised sealing performance. Therefore, a container of unmixed liquid base or accelerator sealant with skinning is considered unserviceable.

59. In what type of aircraft fuselage construction does weight become a problem?

Truss

Cantilever

Monocoque

Semimonocoque

In monocoque aircraft fuselage construction, weight becomes a problem. Monocoque construction involves the use of a single shell or skin to bear the majority of the structural load, which means that the skin must be strong enough to support the entire weight of the aircraft. This can result in a heavier overall structure compared to other types of construction, such as truss or cantilever, where the load is distributed among multiple structural elements. Therefore, weight becomes a concern in monocoque construction.

Explanation

In monocoque aircraft fuselage construction, weight becomes a problem. Monocoque construction involves the use of a single shell or skin to bear the majority of the structural load, which means that the skin must be strong enough to support the entire weight of the aircraft. This can result in a heavier overall structure compared to other types of construction, such as truss or cantilever, where the load is distributed among multiple structural elements. Therefore, weight becomes a concern in monocoque construction.

60. The extent of corrosion on an aircraft surface depends on which of the following factors?

The methods used to wash or clean the area

The type of metal affected by the corrosion

The ambient temperature at which the aircraft is located

The length of time electrolytes are in contact with the metals

The extent of corrosion on an aircraft surface depends on the length of time electrolytes are in contact with the metals. Electrolytes, such as water or saltwater, can accelerate the corrosion process by providing a medium for the transfer of ions between the metal and the environment. The longer the electrolytes are in contact with the metals, the more time they have to cause corrosion. Therefore, the length of time electrolytes are in contact with the metals is a crucial factor in determining the extent of corrosion on an aircraft surface.

Explanation

The extent of corrosion on an aircraft surface depends on the length of time electrolytes are in contact with the metals. Electrolytes, such as water or saltwater, can accelerate the corrosion process by providing a medium for the transfer of ions between the metal and the environment. The longer the electrolytes are in contact with the metals, the more time they have to cause corrosion. Therefore, the length of time electrolytes are in contact with the metals is a crucial factor in determining the extent of corrosion on an aircraft surface.

61. During the preparation of an aircraft for fuel systems maintenance, AF form 979, Danger tag of AF form 1492, warning tag, must be placed on the aircraft's

Fuel control panel only

Fuel control panel and external power receptacle

External power receptacle and grounding refuel receptacle

Ground refuel receptacle and batteries

During the preparation of an aircraft for fuel systems maintenance, the AF form 979, Danger tag of AF form 1492, warning tag, must be placed on the aircraft's fuel control panel and external power receptacle. This is necessary to ensure that anyone approaching the aircraft is aware of the potential danger associated with the fuel control panel and the external power receptacle. By tagging both of these components, it helps to prevent accidental activation or interference with the fuel system and electrical power supply during maintenance operations.

Explanation

During the preparation of an aircraft for fuel systems maintenance, the AF form 979, Danger tag of AF form 1492, warning tag, must be placed on the aircraft's fuel control panel and external power receptacle. This is necessary to ensure that anyone approaching the aircraft is aware of the potential danger associated with the fuel control panel and the external power receptacle. By tagging both of these components, it helps to prevent accidental activation or interference with the fuel system and electrical power supply during maintenance operations.

62. After the defective sealant has been removed, how far from the ends of the fillet should you abrade to prepare the surface for the new fillet?

1/4 in

1/2 in

3/4 in

1 in

To prepare the surface for the new fillet after removing the defective sealant, it is recommended to abrade 1/2 inch from the ends of the fillet. This ensures that the surface is properly roughened and ready to bond with the new fillet, providing a secure and effective seal. Abrading too close to the ends may compromise the strength of the fillet, while abrading too far may result in an inadequate bond. Therefore, abrading 1/2 inch from the ends strikes a balance between these factors, ensuring a reliable and durable seal.

Explanation

To prepare the surface for the new fillet after removing the defective sealant, it is recommended to abrade 1/2 inch from the ends of the fillet. This ensures that the surface is properly roughened and ready to bond with the new fillet, providing a secure and effective seal. Abrading too close to the ends may compromise the strength of the fillet, while abrading too far may result in an inadequate bond. Therefore, abrading 1/2 inch from the ends strikes a balance between these factors, ensuring a reliable and durable seal.

63. What is used to test applied sealant for a tack-free condition?

Blunt metal punch

Bimetallic thermometer

Plastic film

Your Knuckle

Plastic film is used to test applied sealant for a tack-free condition. This is because when the sealant is applied, it needs to dry or cure to a certain degree before it can be touched or handled. By placing a plastic film over the sealant and gently pressing on it, one can check if the sealant has reached the desired tack-free state. If the sealant sticks to the film, it is not yet tack-free, but if it does not stick and is dry to the touch, it indicates that the sealant has cured properly.

Explanation

Plastic film is used to test applied sealant for a tack-free condition. This is because when the sealant is applied, it needs to dry or cure to a certain degree before it can be touched or handled. By placing a plastic film over the sealant and gently pressing on it, one can check if the sealant has reached the desired tack-free state. If the sealant sticks to the film, it is not yet tack-free, but if it does not stick and is dry to the touch, it indicates that the sealant has cured properly.

64. Which of the following temporary repair methods have an immediate cure time?

Hardman epoxy

Epoxy tab

Oylite stik

Comp air d236 injector

The oylite stik is the only temporary repair method listed that has an immediate cure time. This means that once the oylite stik is applied, it will harden and cure immediately, providing an instant temporary fix. The other options listed may require some additional time for the epoxy to cure or set properly before the repair is complete.

Explanation

The oylite stik is the only temporary repair method listed that has an immediate cure time. This means that once the oylite stik is applied, it will harden and cure immediately, providing an instant temporary fix. The other options listed may require some additional time for the epoxy to cure or set properly before the repair is complete.

65. What component is used to locate a leak source by forcing dye solution through the leak exit point?

Vacuum cup

Hollow bolt

Control box

Double cup assembly

A double cup assembly is used to locate a leak source by forcing dye solution through the leak exit point. This assembly consists of two cups that create a seal around the leak area, allowing the dye solution to be injected under pressure. The pressure forces the dye solution to flow through the leak exit point, making it easier to identify the source of the leak.

Explanation

A double cup assembly is used to locate a leak source by forcing dye solution through the leak exit point. This assembly consists of two cups that create a seal around the leak area, allowing the dye solution to be injected under pressure. The pressure forces the dye solution to flow through the leak exit point, making it easier to identify the source of the leak.

66. The minimum hose length from the ambient breathing air pump to the respirators is

10 feet

25 feet

50 feet

100 feet

The minimum hose length from the ambient breathing air pump to the respirators is 50 feet. This length is necessary to ensure that there is enough distance for the air to travel and be filtered properly before reaching the respirators. A longer hose also allows for more flexibility and mobility for the users while still maintaining a safe distance from the pump. A shorter hose may not provide sufficient filtration and could potentially compromise the quality of the air being breathed in by the users.

Explanation

The minimum hose length from the ambient breathing air pump to the respirators is 50 feet. This length is necessary to ensure that there is enough distance for the air to travel and be filtered properly before reaching the respirators. A longer hose also allows for more flexibility and mobility for the users while still maintaining a safe distance from the pump. A shorter hose may not provide sufficient filtration and could potentially compromise the quality of the air being breathed in by the users.

67. Aircraft which are adjacent to an open fuel system repair area must not be operated under their own power within

50 feet

100 feet

150 feet

200 feet

Aircraft which are adjacent to an open fuel system repair area must not be operated under their own power within 100 feet. This is because operating an aircraft under its own power in close proximity to an open fuel system repair area can pose a significant safety risk. The potential for fuel leaks or ignition sources in the repair area increases the risk of fire or explosion if the aircraft is operated within 100 feet. Therefore, it is necessary to maintain a safe distance of 100 feet to mitigate these risks and ensure the safety of personnel and equipment.

Explanation

Aircraft which are adjacent to an open fuel system repair area must not be operated under their own power within 100 feet. This is because operating an aircraft under its own power in close proximity to an open fuel system repair area can pose a significant safety risk. The potential for fuel leaks or ignition sources in the repair area increases the risk of fire or explosion if the aircraft is operated within 100 feet. Therefore, it is necessary to maintain a safe distance of 100 feet to mitigate these risks and ensure the safety of personnel and equipment.

68. When blow purging an aircraft fuel tank, what step should be taken immediately after removing the access door?

Turn on the blower unit

Bond the duct to the aircraft

Place the duct in the tank opening

Take a lower explosive limit reading of the tank atmosphere

After removing the access door, the next step in blow purging an aircraft fuel tank is to place the duct in the tank opening. This is necessary in order to direct the flow of air into the tank and facilitate the removal of any flammable vapors or gases. By placing the duct in the tank opening, the air can be properly circulated and the tank can be effectively purged before any maintenance or repairs are conducted.

Explanation

After removing the access door, the next step in blow purging an aircraft fuel tank is to place the duct in the tank opening. This is necessary in order to direct the flow of air into the tank and facilitate the removal of any flammable vapors or gases. By placing the duct in the tank opening, the air can be properly circulated and the tank can be effectively purged before any maintenance or repairs are conducted.

69. What component is used to locate a leak source by forcing dye solution through the leak exit point?

Vacuum cup

Hollow bolt

Control box

Double cup assembly

The double cup assembly is used to locate a leak source by forcing dye solution through the leak exit point. This assembly consists of two cups that create a seal around the leak area, allowing the dye solution to be injected under pressure. The pressure forces the dye solution through the leak exit point, making it easier to identify the source of the leak.

Explanation

The double cup assembly is used to locate a leak source by forcing dye solution through the leak exit point. This assembly consists of two cups that create a seal around the leak area, allowing the dye solution to be injected under pressure. The pressure forces the dye solution through the leak exit point, making it easier to identify the source of the leak.

70. Which of the following is an acceptable method of checking an integral tank sealant area for adhesion?

Push on sealant with a blunt metal punch

Pull sealant away from surface with a hooked wire

Apply a maximum of 100 psi air pressure to sealant

Insert aluminum spatula between sealant and structure

Applying a maximum of 100 psi air pressure to the sealant is an acceptable method of checking its adhesion. This method tests the integrity of the sealant by subjecting it to a controlled amount of pressure. If the sealant remains intact and does not show any signs of separation or detachment, it indicates good adhesion to the surface. This method is commonly used in aerospace and other industries to ensure the quality and effectiveness of sealant applications.

Explanation

Applying a maximum of 100 psi air pressure to the sealant is an acceptable method of checking its adhesion. This method tests the integrity of the sealant by subjecting it to a controlled amount of pressure. If the sealant remains intact and does not show any signs of separation or detachment, it indicates good adhesion to the surface. This method is commonly used in aerospace and other industries to ensure the quality and effectiveness of sealant applications.

71. Which basic type of access door opens into the fuel tank, providing a tighter seal than other types?

Plug

O-ring

Direct seal

Interference fit

A plug is a basic type of access door that opens into the fuel tank, providing a tighter seal than other types. The term "plug" refers to a solid object that can be inserted or removed to open or close an opening. In this case, the plug acts as a door that can be opened to access the fuel tank and closed to create a tight seal, preventing any leakage or contamination. This type of access door is commonly used in fuel tanks to ensure the safety and integrity of the fuel system.

Explanation

A plug is a basic type of access door that opens into the fuel tank, providing a tighter seal than other types. The term "plug" refers to a solid object that can be inserted or removed to open or close an opening. In this case, the plug acts as a door that can be opened to access the fuel tank and closed to create a tight seal, preventing any leakage or contamination. This type of access door is commonly used in fuel tanks to ensure the safety and integrity of the fuel system.

72. What type of fastener is installed in an integral tank where access to only one side of the work is possible?

Brazier head rivet

Nut and bolt

Jo-bolt

Hi-lok

Jo-bolts are fasteners that are specifically designed to be installed in situations where access to only one side of the work is possible. They consist of a threaded rod with a specially designed head that can be installed from one side and secured with a nut on the other side. This makes them ideal for use in integral tanks where it may be difficult or impossible to access both sides of the work.

Explanation

Jo-bolts are fasteners that are specifically designed to be installed in situations where access to only one side of the work is possible. They consist of a threaded rod with a specially designed head that can be installed from one side and secured with a nut on the other side. This makes them ideal for use in integral tanks where it may be difficult or impossible to access both sides of the work.

73. Which is a feature of the MC-7 Air compressor?

Capable of delivering high volumes of air

Delivers a maximum pressure of 200 psi

Can be used as a source of breathing air

Gas engine will run for one houre without refueling

The MC-7 Air compressor is capable of delivering high volumes of air. This means that it can produce a large amount of compressed air, making it suitable for applications that require a high flow rate. This feature makes the MC-7 Air compressor efficient and effective in tasks such as powering pneumatic tools, inflating tires, or operating machinery that relies on compressed air.

Explanation

The MC-7 Air compressor is capable of delivering high volumes of air. This means that it can produce a large amount of compressed air, making it suitable for applications that require a high flow rate. This feature makes the MC-7 Air compressor efficient and effective in tasks such as powering pneumatic tools, inflating tires, or operating machinery that relies on compressed air.

74. All installed vent plugs that will affect the venting of the aircraft must have

An AFTO form 350, warning tag, attached.

A red "REMOVE BEFORE FLIGHT" streamer attached

A yellow "REMOVE BEFORE FUELING/DEFUELING" streamer attached

A white "DO NOT LEAVE ON AIRCRAFT" streamer attached

The correct answer is a yellow "REMOVE BEFORE FUELING/DEFUELING" streamer attached. This is because during the fueling or defueling process of an aircraft, it is crucial to ensure that all vent plugs are removed to prevent any blockages or restrictions in the venting system. The yellow streamer serves as a visual reminder to the ground crew that the vent plug needs to be removed before the fueling or defueling process begins.

Explanation

The correct answer is a yellow "REMOVE BEFORE FUELING/DEFUELING" streamer attached. This is because during the fueling or defueling process of an aircraft, it is crucial to ensure that all vent plugs are removed to prevent any blockages or restrictions in the venting system. The yellow streamer serves as a visual reminder to the ground crew that the vent plug needs to be removed before the fueling or defueling process begins.

75. The size of the applied fillet on the filleting gun is determined by the

Width of the nozzle

Length of the nozzle

Amount of air pressure

Size and cut of the nozzle

The size and cut of the nozzle determine the size of the applied fillet on the filleting gun. The nozzle controls the flow of material, and its size and shape directly affect the amount and shape of the fillet being applied. A larger or differently shaped nozzle will result in a different size or shape of the fillet, while a smaller or differently cut nozzle will produce a smaller or differently cut fillet. Therefore, the size and cut of the nozzle are crucial factors in determining the size of the applied fillet.

Explanation

The size and cut of the nozzle determine the size of the applied fillet on the filleting gun. The nozzle controls the flow of material, and its size and shape directly affect the amount and shape of the fillet being applied. A larger or differently shaped nozzle will result in a different size or shape of the fillet, while a smaller or differently cut nozzle will produce a smaller or differently cut fillet. Therefore, the size and cut of the nozzle are crucial factors in determining the size of the applied fillet.

76. What structure standard must the masonry fire restrictive construction of a new facility meet as a minimum?

1 hour

2 hour

3 hour

4 hour

The masonry fire restrictive construction of a new facility must meet a minimum standard of 1 hour. This means that the construction should be able to resist the spread of fire for at least 1 hour, providing a certain level of fire protection and safety for the occupants of the facility. This standard ensures that the masonry construction is able to withstand the heat and flames of a fire for a reasonable amount of time, allowing for evacuation and firefighting efforts to take place.

Explanation

The masonry fire restrictive construction of a new facility must meet a minimum standard of 1 hour. This means that the construction should be able to resist the spread of fire for at least 1 hour, providing a certain level of fire protection and safety for the occupants of the facility. This standard ensures that the masonry construction is able to withstand the heat and flames of a fire for a reasonable amount of time, allowing for evacuation and firefighting efforts to take place.

77. During an integral tank inspection, you discover an area at which the protective coating is scarred and the metal is discolored. Pitting has also occurred to a depth or one mil. What degree of corrosion has taken place?

Light

Severe

Moderate

Intermediate

The given description indicates that there is some damage to the protective coating and the metal is discolored, but the pitting is only one mil deep. This suggests that the corrosion is not very extensive and is considered to be light.

Explanation

The given description indicates that there is some damage to the protective coating and the metal is discolored, but the pitting is only one mil deep. This suggests that the corrosion is not very extensive and is considered to be light.

78. You should apply final torque to a wet installed fastener

Immediately

After two hours

Before the end of sealant application life

Before the end of sealant tack free time

The correct answer is "before the end of sealant application life" because applying final torque to a wet installed fastener before the sealant application life ends ensures that the fastener is properly tightened and secured while the sealant is still in its optimal state. If the torque is applied after the sealant application life ends, there is a risk that the sealant may have already cured or hardened, which could affect the effectiveness of the fastener installation.

Explanation

The correct answer is "before the end of sealant application life" because applying final torque to a wet installed fastener before the sealant application life ends ensures that the fastener is properly tightened and secured while the sealant is still in its optimal state. If the torque is applied after the sealant application life ends, there is a risk that the sealant may have already cured or hardened, which could affect the effectiveness of the fastener installation.

79. Temporary repair made during the delivery preparation phase of depot maintenace must not exceed

One per tank

Two per tank

One per aircraft

Two per aircraft

During the delivery preparation phase of depot maintenance, a temporary repair should not exceed one per tank. This means that only one temporary repair should be made for each tank being worked on. Making more than one repair per tank during this phase may lead to complications or errors in the maintenance process.

Explanation

During the delivery preparation phase of depot maintenance, a temporary repair should not exceed one per tank. This means that only one temporary repair should be made for each tank being worked on. Making more than one repair per tank during this phase may lead to complications or errors in the maintenance process.

80. What item of hardware should be installed with scrrews and bolts whenever the self-locking or castellated nut is not used?

Cotter pins

Safety wire

Lockwashers

Plain washers

Lockwashers should be installed with screws and bolts whenever the self-locking or castellated nut is not used. Lockwashers are designed to prevent loosening or rotation of the fastener by creating tension between the nut and the bolted surface. They provide a secure and reliable connection, reducing the risk of loosening due to vibrations or other external forces. By using lockwashers, the fasteners can maintain their tightness and keep the hardware in place, ensuring the stability and safety of the installation.

Explanation

Lockwashers should be installed with screws and bolts whenever the self-locking or castellated nut is not used. Lockwashers are designed to prevent loosening or rotation of the fastener by creating tension between the nut and the bolted surface. They provide a secure and reliable connection, reducing the risk of loosening due to vibrations or other external forces. By using lockwashers, the fasteners can maintain their tightness and keep the hardware in place, ensuring the stability and safety of the installation.

81. For what reason is aluminum alloy tubing the most widely used?

It can withstand high pressures

It is easily flared with hand tools

It is generally heavier than other types

It resists dents better than other types

Aluminum alloy tubing is the most widely used because it can be easily flared with hand tools. This means that it can be easily shaped and manipulated to fit various applications and requirements.

Explanation

Aluminum alloy tubing is the most widely used because it can be easily flared with hand tools. This means that it can be easily shaped and manipulated to fit various applications and requirements.

82. All values displayed on the T477W bonging meter are in

Ohms

Milliohms

Volts

Millivolts

The T477W bonging meter displays values in milliohms. This means that the meter measures electrical resistance in units of milliohms, which are equal to one thousandth of an ohm.

Explanation

The T477W bonging meter displays values in milliohms. This means that the meter measures electrical resistance in units of milliohms, which are equal to one thousandth of an ohm.

83. What equipment in a fuel system repair facility is used to extract fuel vapors outside the facility during such operations as defueling and air purging?

Installed exhaust fan

Climate control unit

Venturi air mover

MA-1 blower

An installed exhaust fan is used in a fuel system repair facility to extract fuel vapors outside the facility during operations like defueling and air purging. This equipment helps to maintain a safe and clean working environment by removing potentially hazardous fumes and preventing their accumulation within the facility. It ensures proper ventilation and reduces the risk of fire or explosion caused by the buildup of fuel vapors.

Explanation

An installed exhaust fan is used in a fuel system repair facility to extract fuel vapors outside the facility during operations like defueling and air purging. This equipment helps to maintain a safe and clean working environment by removing potentially hazardous fumes and preventing their accumulation within the facility. It ensures proper ventilation and reduces the risk of fire or explosion caused by the buildup of fuel vapors.

84. What type of fuselage construction uses a fabric or thin metal covering, and may be found on small, lightweight aircraft?

Truss

Cantilever

Monocoque

Semimonoque

Truss construction is a type of fuselage construction that uses a fabric or thin metal covering and is commonly found on small, lightweight aircraft. In truss construction, the load-bearing structure consists of a series of interconnected triangular frames, which provide strength and support to the aircraft. This type of construction is lightweight, cost-effective, and relatively easy to repair, making it suitable for smaller aircraft where weight and simplicity are important factors.

Explanation

Truss construction is a type of fuselage construction that uses a fabric or thin metal covering and is commonly found on small, lightweight aircraft. In truss construction, the load-bearing structure consists of a series of interconnected triangular frames, which provide strength and support to the aircraft. This type of construction is lightweight, cost-effective, and relatively easy to repair, making it suitable for smaller aircraft where weight and simplicity are important factors.

85. Which punch is used to drive out pins that are too deep for a starting or drift punch?

Prick

Straight

Center

A pin punch is used to drive out pins that are too deep for a starting or drift punch. A pin punch has a long, slender design with a pointed tip that allows it to reach into tight spaces and apply force to the pin. It is specifically designed for removing pins and can effectively drive them out without causing damage to the surrounding material.

Explanation

A pin punch is used to drive out pins that are too deep for a starting or drift punch. A pin punch has a long, slender design with a pointed tip that allows it to reach into tight spaces and apply force to the pin. It is specifically designed for removing pins and can effectively drive them out without causing damage to the surrounding material.

86. For what maximun perido of time may a field permit be issued?

24 hours

One month

Six months

One year

A field permit can be issued for a maximum period of one year. This means that the permit allows the holder to use the field for various activities, such as events, sports, or farming, for a duration of up to one year. This longer time frame provides flexibility and convenience for the permit holder to plan and carry out their activities on the field without the need for frequent renewals or extensions.

Explanation

A field permit can be issued for a maximum period of one year. This means that the permit allows the holder to use the field for various activities, such as events, sports, or farming, for a duration of up to one year. This longer time frame provides flexibility and convenience for the permit holder to plan and carry out their activities on the field without the need for frequent renewals or extensions.

87. The structural components that form the end boundaries of an integral tank are the

Ribs

Spars

Stringers

Stiffeners

Ribs are structural components that form the end boundaries of an integral tank. Ribs are long, narrow, and curved structures that provide strength and support to the tank. They are typically placed perpendicular to the longitudinal axis of the tank and are attached to the skin of the tank. Ribs help to distribute the load evenly across the tank and prevent deformation or collapse. They also add rigidity and stability to the tank structure, ensuring its integrity and durability.

Explanation

Ribs are structural components that form the end boundaries of an integral tank. Ribs are long, narrow, and curved structures that provide strength and support to the tank. They are typically placed perpendicular to the longitudinal axis of the tank and are attached to the skin of the tank. Ribs help to distribute the load evenly across the tank and prevent deformation or collapse. They also add rigidity and stability to the tank structure, ensuring its integrity and durability.

88. The most preffered temporary repair method is the

Hardman epoxy with aluminum foil patch

Aluminum foil patch with sealant

Oylite stick

Epoxy tab

The most preferred temporary repair method is the hardman epoxy with aluminum foil patch. This method is preferred because the hardman epoxy provides a strong and durable bond, while the aluminum foil patch adds an extra layer of protection and reinforcement. Together, they create a reliable temporary repair solution that can withstand various conditions and provide a long-lasting fix.

Explanation

The most preferred temporary repair method is the hardman epoxy with aluminum foil patch. This method is preferred because the hardman epoxy provides a strong and durable bond, while the aluminum foil patch adds an extra layer of protection and reinforcement. Together, they create a reliable temporary repair solution that can withstand various conditions and provide a long-lasting fix.

89. The proper reading on an oxygen analyzer for a fuel tank that has been siphon inerted is

9 percent

15 percent

20 percent

23 percent

When a fuel tank is siphon inerted, it means that the oxygen has been removed from the tank to prevent combustion. Therefore, the proper reading on an oxygen analyzer for such a tank would be low or close to zero percent. Among the given options, the closest value to zero percent is 9 percent, making it the correct answer.

Explanation

When a fuel tank is siphon inerted, it means that the oxygen has been removed from the tank to prevent combustion. Therefore, the proper reading on an oxygen analyzer for such a tank would be low or close to zero percent. Among the given options, the closest value to zero percent is 9 percent, making it the correct answer.

90. When using an MA-1 blower to exhaust purge a fuel tank, what blower component must be removed?

Filter

Air duct

Inlet plug

Bonding/grounding wire

When using an MA-1 blower to exhaust purge a fuel tank, the filter must be removed. This is because the purpose of exhaust purging is to remove any contaminants or impurities from the fuel tank, and the filter could potentially trap these contaminants and prevent them from being effectively removed. By removing the filter, the blower can more efficiently exhaust purge the fuel tank and ensure that it is thoroughly cleaned.

Explanation

When using an MA-1 blower to exhaust purge a fuel tank, the filter must be removed. This is because the purpose of exhaust purging is to remove any contaminants or impurities from the fuel tank, and the filter could potentially trap these contaminants and prevent them from being effectively removed. By removing the filter, the blower can more efficiently exhaust purge the fuel tank and ensure that it is thoroughly cleaned.

91. When must a safety guard be station at the fuel cell/tank servicing cart?

Anytime the cart is in the repair area

Each time the air supply system is used

During access door removal and cell/tank purging

Whenever two or more personnel are using respirators

A safety guard must be stationed at the fuel cell/tank servicing cart each time the air supply system is used. This is important because the air supply system is a critical component of the cart and its operation can pose potential risks or hazards. Having a safety guard present ensures that proper safety measures are followed and any issues or emergencies can be addressed promptly.

Explanation

A safety guard must be stationed at the fuel cell/tank servicing cart each time the air supply system is used. This is important because the air supply system is a critical component of the cart and its operation can pose potential risks or hazards. Having a safety guard present ensures that proper safety measures are followed and any issues or emergencies can be addressed promptly.

92. Who signs the Master Entry Permit and ensures that all safety and health requirements are met?

Entry authority

Equipment monitor/runner

Maintenance Group Commander

Fuel System Element Chief

The Maintenance Group Commander is responsible for signing the Master Entry Permit and ensuring that all safety and health requirements are met. This includes overseeing the maintenance operations and ensuring that proper safety protocols are followed to prevent any accidents or hazards. They have the authority and knowledge to ensure that all necessary precautions are taken before any work is carried out, making them the appropriate person to sign the permit.

Explanation

The Maintenance Group Commander is responsible for signing the Master Entry Permit and ensuring that all safety and health requirements are met. This includes overseeing the maintenance operations and ensuring that proper safety protocols are followed to prevent any accidents or hazards. They have the authority and knowledge to ensure that all necessary precautions are taken before any work is carried out, making them the appropriate person to sign the permit.

93. You should add 1/2 oz. oil to pneumatic blower unit

Every four hours during use

After every day of use

After every use

Before use

The correct answer is after every day of use. This means that the pneumatic blower unit should have 1/2 oz. of oil added to it at the end of each day that it is used. Adding oil after every day of use helps to ensure that the blower unit remains properly lubricated and functioning efficiently.

Explanation

The correct answer is after every day of use. This means that the pneumatic blower unit should have 1/2 oz. of oil added to it at the end of each day that it is used. Adding oil after every day of use helps to ensure that the blower unit remains properly lubricated and functioning efficiently.

94. As part of a maintenance preparation checklist, you should ensure all support equipment used in a fuel system are is

Bonded

Grounded

Placed upwind

Placed downwind

In a maintenance preparation checklist, ensuring that all support equipment used in a fuel system is bonded is important. Bonding refers to the process of connecting all metal parts of the equipment to prevent the buildup of static electricity. This is crucial in fuel systems to prevent the occurrence of sparks that could potentially ignite fuel vapors, leading to a fire or explosion. By bonding the support equipment, the risk of static electricity discharge is minimized, ensuring the safety of the fuel system and preventing any potential accidents.

Explanation

In a maintenance preparation checklist, ensuring that all support equipment used in a fuel system is bonded is important. Bonding refers to the process of connecting all metal parts of the equipment to prevent the buildup of static electricity. This is crucial in fuel systems to prevent the occurrence of sparks that could potentially ignite fuel vapors, leading to a fire or explosion. By bonding the support equipment, the risk of static electricity discharge is minimized, ensuring the safety of the fuel system and preventing any potential accidents.

95. Which type of hose is a medium pressure Teflon hose with an operating temperature of 65 to 450* F?

MIL-H-8794

MIL-H-27267

MIL-H-7938

MIL-H-7061

The correct answer is MIL-H-27267. This type of hose is a medium pressure Teflon hose with an operating temperature range of 65 to 450* F.

Explanation

The correct answer is MIL-H-27267. This type of hose is a medium pressure Teflon hose with an operating temperature range of 65 to 450* F.

96. What step should be taken first when attempting to locate a leak exit point on or near a common tank boundary?

Defuel both tanks

Defuel the inboard tank

Defuel the outboard tank

Drain residual fuel from outboard tank

When attempting to locate a leak exit point on or near a common tank boundary, the first step should be to defuel the outboard tank. This is because the outboard tank is located on the outer side of the common tank boundary and is more likely to have a leak that can be detected. By defueling the outboard tank, it reduces the amount of fuel that needs to be inspected and allows for a more focused search for the leak exit point.

Explanation

When attempting to locate a leak exit point on or near a common tank boundary, the first step should be to defuel the outboard tank. This is because the outboard tank is located on the outer side of the common tank boundary and is more likely to have a leak that can be detected. By defueling the outboard tank, it reduces the amount of fuel that needs to be inspected and allows for a more focused search for the leak exit point.

97. Whicf of the following high-adhesion sealants is designed for limited service life at temperature up to 360 F?

MIL-S-8802

MIL-S-83430

MIL-S-81733

MIL-S-83318

MIL-S-83430 is the correct answer because it is a high-adhesion sealant that is specifically designed for limited service life at temperatures up to 360 F. The other options, MIL-S-8802, MIL-S-81733, and MIL-S-83318, may be high-adhesion sealants but they are not designed for use at temperatures up to 360 F.

Explanation

MIL-S-83430 is the correct answer because it is a high-adhesion sealant that is specifically designed for limited service life at temperatures up to 360 F. The other options, MIL-S-8802, MIL-S-81733, and MIL-S-83318, may be high-adhesion sealants but they are not designed for use at temperatures up to 360 F.

98. Which of the following are not required elements of the written emergency response plan?

Practice rescue

Roles of emergency agencies

Rescue from IDLH environments

Rescue team training documentation

Rescue team training documentation is not a required element of the written emergency response plan. While it is important for the rescue team to undergo training, documenting this training is not necessary for the emergency response plan itself. The plan should include practice rescue, roles of emergency agencies, and rescue from IDLH (Immediately Dangerous to Life or Health) environments as these are crucial elements in responding effectively to emergencies.

Explanation

Rescue team training documentation is not a required element of the written emergency response plan. While it is important for the rescue team to undergo training, documenting this training is not necessary for the emergency response plan itself. The plan should include practice rescue, roles of emergency agencies, and rescue from IDLH (Immediately Dangerous to Life or Health) environments as these are crucial elements in responding effectively to emergencies.

99. What is the first step in performing the talcum power method of leak detection?

Wipe are dry

Defuel the tank

Strip exterior seals

Dust area with powde

The first step in performing the talcum powder method of leak detection is to strip the exterior seals. This involves removing any seals or gaskets that cover the potential areas of leakage. By doing this, the technician can expose the surfaces where the talcum powder will be applied. This step is crucial as it ensures that the powder can directly come in contact with the surfaces and effectively detect any leaks that may be present.

Explanation

The first step in performing the talcum powder method of leak detection is to strip the exterior seals. This involves removing any seals or gaskets that cover the potential areas of leakage. By doing this, the technician can expose the surfaces where the talcum powder will be applied. This step is crucial as it ensures that the powder can directly come in contact with the surfaces and effectively detect any leaks that may be present.

100. What method of leak source detection should only be used after all other methods have failed to isolate the leak source?

Vacuum dye

Pressure box

Dye injection

Vacuum bubble

Vacuum dye should only be used after all other methods have failed to isolate the leak source because it is a more invasive and time-consuming method. Vacuum dye involves creating a vacuum within the system and introducing a dye that will be drawn into the leak, making it visible under UV light. This method is typically used as a last resort when other methods, such as pressure testing or dye injection, have been unsuccessful in locating the source of the leak.

Explanation

Vacuum dye should only be used after all other methods have failed to isolate the leak source because it is a more invasive and time-consuming method. Vacuum dye involves creating a vacuum within the system and introducing a dye that will be drawn into the leak, making it visible under UV light. This method is typically used as a last resort when other methods, such as pressure testing or dye injection, have been unsuccessful in locating the source of the leak.

101. As a precaution againts air bubbles, a first fillet seal should be

Throroughly worked into the structure with an acid brush

Applied with a filleting gun filled with class A sealant

Thoroughly worked into the structure with a sealant spatula

Applied with a sealant injection gun filled with class A sealant

To prevent the formation of air bubbles, the first fillet seal should be thoroughly worked into the structure. This can be done effectively using a sealant spatula, which allows for precise application and ensures that the sealant is evenly distributed. Working the sealant into the structure helps to eliminate any trapped air, ensuring a secure and reliable seal. Using a sealant injection gun or a filleting gun filled with class A sealant may not provide the same level of control and precision, increasing the risk of air bubbles forming.

Explanation

To prevent the formation of air bubbles, the first fillet seal should be thoroughly worked into the structure. This can be done effectively using a sealant spatula, which allows for precise application and ensures that the sealant is evenly distributed. Working the sealant into the structure helps to eliminate any trapped air, ensuring a secure and reliable seal. Using a sealant injection gun or a filleting gun filled with class A sealant may not provide the same level of control and precision, increasing the risk of air bubbles forming.

102. What is the pressure ratio for the high-pressure injection gun?

50 to 1

60 to 1

70 to 1

80 to 1

The pressure ratio for the high-pressure injection gun is 70 to 1. This means that the pressure of the gun is 70 times higher than the initial pressure. This high pressure allows for efficient and effective injection of substances into the desired target.

Explanation

The pressure ratio for the high-pressure injection gun is 70 to 1. This means that the pressure of the gun is 70 times higher than the initial pressure. This high pressure allows for efficient and effective injection of substances into the desired target.

103. Low-pressure injection seals are applied with a

Prepack spatula

Seallant filleting gun

Low-pressure injection gun

Hig-pressure injection gun equipped with low-pressure nozzles

A sealant filleting gun is used for low-pressure injection seals. This type of gun is specifically designed for applying sealant in a precise and controlled manner along the edges or fillets of a joint. It allows for accurate placement of the sealant, ensuring a proper seal without any excess or wastage. This method is commonly used in various industries such as construction, automotive, and aerospace, where a reliable and efficient seal is required.

Explanation

A sealant filleting gun is used for low-pressure injection seals. This type of gun is specifically designed for applying sealant in a precise and controlled manner along the edges or fillets of a joint. It allows for accurate placement of the sealant, ensuring a proper seal without any excess or wastage. This method is commonly used in various industries such as construction, automotive, and aerospace, where a reliable and efficient seal is required.

104. What equipment item must be used with the MC-1 heater to reduce the temperature of the air coming from the heater?

A filter

An ambient air blower

A plenum chamber

An exhaust director

A plenum chamber must be used with the MC-1 heater to reduce the temperature of the air coming from the heater. A plenum chamber is a device that helps distribute and mix the heated air evenly throughout a space. It allows for the air to cool down before being released into the area, ensuring that the temperature is suitable for the intended application.

Explanation

A plenum chamber must be used with the MC-1 heater to reduce the temperature of the air coming from the heater. A plenum chamber is a device that helps distribute and mix the heated air evenly throughout a space. It allows for the air to cool down before being released into the area, ensuring that the temperature is suitable for the intended application.

105. What support equipment item has both low- and high-air pressure system?

MC-1A

MC-2A

MC-5

MC-7

The MC-1A support equipment item has both low- and high-air pressure systems.

Explanation

The MC-1A support equipment item has both low- and high-air pressure systems.

106. Which of the following items are acceptable for use in fluid purging an aircraft fuel tank

JP-4

JP-5

MIL-C_38736

P-D-680, Type II

JP-5 is the only acceptable item for use in fluid purging an aircraft fuel tank. The other options mentioned, JP-4, MIL-C_38736, and P-D-680, Type II, are not suitable for this purpose.

Explanation

JP-5 is the only acceptable item for use in fluid purging an aircraft fuel tank. The other options mentioned, JP-4, MIL-C_38736, and P-D-680, Type II, are not suitable for this purpose.

107. An equipment item that provides rapid purging of fuel tanks and supplies breathing air is the

Ventilation trailer

Air/nitrogen servicing trailer

Fuel cell/tank servicing cart

Ambient breathing air pump

A ventilation trailer is an equipment item that provides rapid purging of fuel tanks and supplies breathing air. It is specifically designed to ventilate and remove fumes from confined spaces such as fuel tanks. It ensures the safety of workers by providing a continuous supply of clean breathing air while purging the tanks. The other options, such as an air/nitrogen servicing trailer, fuel cell/tank servicing cart, and ambient breathing air pump, do not specifically mention the capability of rapid purging of fuel tanks and supplying breathing air, making them incorrect choices. Therefore, the correct answer is the ventilation trailer.

Explanation

A ventilation trailer is an equipment item that provides rapid purging of fuel tanks and supplies breathing air. It is specifically designed to ventilate and remove fumes from confined spaces such as fuel tanks. It ensures the safety of workers by providing a continuous supply of clean breathing air while purging the tanks. The other options, such as an air/nitrogen servicing trailer, fuel cell/tank servicing cart, and ambient breathing air pump, do not specifically mention the capability of rapid purging of fuel tanks and supplying breathing air, making them incorrect choices. Therefore, the correct answer is the ventilation trailer.

108. If a leak develops between faying surfaces of an aircraft structure which was sealed with structural adhesive, how would you repair it?

Apply a curing-type fillet or overcoat

Pack curing-type sealant between the faying surfaces

Disassemble the structure and apply structural adhesion

Inject curing-type sealant into the void between mating surfaces

If a leak develops between faying surfaces of an aircraft structure that was sealed with structural adhesive, the best way to repair it would be to apply a curing-type fillet or overcoat. This involves applying a layer of the same type of adhesive used initially to seal the surfaces. This method ensures that the leak is effectively sealed and the structural integrity of the aircraft is maintained.

Explanation

If a leak develops between faying surfaces of an aircraft structure that was sealed with structural adhesive, the best way to repair it would be to apply a curing-type fillet or overcoat. This involves applying a layer of the same type of adhesive used initially to seal the surfaces. This method ensures that the leak is effectively sealed and the structural integrity of the aircraft is maintained.

109. The proper reading on an oxygen analyzer for a fuel tank that has been pressure inerted is

4 percent

9 percent

19.5 percent

21.5 percent

The proper reading on an oxygen analyzer for a fuel tank that has been pressure inerted is 4 percent. This means that the oxygen level inside the fuel tank is at 4 percent, indicating that the tank has been properly inerted to prevent the risk of fire or explosion.

Explanation

The proper reading on an oxygen analyzer for a fuel tank that has been pressure inerted is 4 percent. This means that the oxygen level inside the fuel tank is at 4 percent, indicating that the tank has been properly inerted to prevent the risk of fire or explosion.

110. What should the entry authority do with a canceled entry permit after task completion?

Maintain it for one year

Foward it to the BES office

Foward it to the Ground Safety Office

Foward it to the Logistics Group Commander

The entry authority should forward the canceled entry permit to the Ground Safety Office. This is likely because the Ground Safety Office is responsible for handling and managing safety-related matters, and the canceled entry permit may contain important information or records that need to be kept for safety purposes.

Explanation

The entry authority should forward the canceled entry permit to the Ground Safety Office. This is likely because the Ground Safety Office is responsible for handling and managing safety-related matters, and the canceled entry permit may contain important information or records that need to be kept for safety purposes.

2A654 Volume 3 CDC