# 2A655 Volume 3 Unit Review 1-60(Aircraft)

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Quizzes Created: 3 | Total Attempts: 2,039
Questions: 60 | Attempts: 834

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• 1.

### (401)  If a hydraulic reservoir is pressurized to 25psi, what would be the minimum psi pressure in the return line to the reservoir?

• A.

5

• B.

25

• C.

50

B. 25
Explanation
The minimum psi pressure in the return line to the reservoir would be 25. This is because the hydraulic reservoir is already pressurized to 25 psi, so the pressure in the return line would need to be at least the same in order for the fluid to flow back into the reservoir.

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• 2.

### (402) Variable-volume pumps do not require a seperate pressure regulating device in the system because

• A.

They deliver low pressure

• B.

They have an integral compenator

• C.

The case drain wil relieve high system pressure

B. They have an integral compenator
Explanation
Variable-volume pumps do not require a separate pressure regulating device in the system because they have an integral compensator. This means that the pump is able to automatically adjust its output pressure based on the system's demand. The integral compensator allows the pump to maintain a consistent pressure without the need for an additional regulating device.

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• 3.

### (402) what happens as the drive shaft rotates on a Stratopower pump?

• A.

Both the cylinder block and pistons rotate.

• B.

The universal link and cylinder block rotates.

• C.

The pistons move back and forth, and the cylinder block is stationary.

C. The pistons move back and forth, and the cylinder block is stationary.
Explanation
As the drive shaft rotates on a Stratopower pump, the pistons move back and forth while the cylinder block remains stationary. This means that the pistons are responsible for creating the pumping action, while the cylinder block serves as a stable housing for the pistons.

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• 4.

### (402) In the Stratopower variable-volume pump, the piston are held in contact with the cam plate by the

• A.

Fixed pivot

• B.

Fixed pivot

• C.

Nutating plate

C. Nutating plate
Explanation
The Stratopower variable-volume pump uses a nutating plate to hold the pistons in contact with the cam plate. The nutating plate is a component that moves in a circular motion, causing the pistons to follow the contour of the cam plate. This allows for efficient pumping action and ensures that the pistons maintain contact with the cam plate throughout the pumping process. The use of a nutating plate in this pump design helps to optimize performance and reliability.

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• 5.

### (402) In order to change the direction of rotation of a hydraulic motor, what should be done?

• A.

Change the foot values

• B.

The head should be rotated 180 degrees

• C.

Change the direction of fluid flow into the motor

C. Change the direction of fluid flow into the motor
Explanation
To change the direction of rotation of a hydraulic motor, the direction of fluid flow into the motor should be changed. Hydraulic motors rely on the flow of fluid to generate rotational motion. By reversing the direction of fluid flow, the motor will rotate in the opposite direction. This can be achieved by adjusting the valves or changing the configuration of the hydraulic system to redirect the fluid flow.

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• 6.

### (403)  What principle does a filter assembly with a differential pressure indicator operator?

• A.

The increase of fluid viscosity as the temperature is lowered

• B.

The difference between pressure entering the element and pressure leaving the element

• C.

The spring loaded magnetic indicator postin pop-up when contaminated

B. The difference between pressure entering the element and pressure leaving the element
Explanation
A filter assembly with a differential pressure indicator operates based on the principle of measuring the difference between the pressure entering the filter element and the pressure leaving the filter element. This allows the operator to monitor the pressure drop across the filter, which indicates the level of contamination or clogging. By observing the differential pressure, the operator can determine when the filter needs to be cleaned or replaced to maintain optimal filtration efficiency.

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• 7.

### (404) Which line is a manually-operated check valve usually installed?

• A.

Pressure

• B.

Supply

• C.

Return

A. Pressure
Explanation
A manually-operated check valve is typically installed in the pressure line. This is because the purpose of a check valve is to allow fluid flow in one direction and prevent backflow. By installing it in the pressure line, it ensures that the fluid can only flow in the desired direction, maintaining the desired pressure in the system.

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• 8.

### (404)  Which type of shutoff valve gives a positive indication of the position of the valve?

• A.

Hydraulically operated

• B.

Motor operated

• C.

Manually operated

B. Motor operated
Explanation
Motor operated shutoff valves give a positive indication of the position of the valve. This means that the valve can be controlled remotely and the operator can receive feedback on whether the valve is open or closed. This is typically achieved through the use of sensors or switches that provide a signal indicating the valve's position. This feature is beneficial in situations where it is important to have accurate and reliable information about the valve's status, such as in industrial processes or emergency shutdown systems.

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• 9.

### (404)  If a relief valve with a ball seat area of 1/6 sq. in to relive 1800psi. the spring tension would

• A.

Be 1800 lbs

• B.

Be 30 lbs with no back pressure

• C.

Be 300 lbs with no back pressure

C. Be 300 lbs with no back pressure
Explanation
The correct answer is "be 300 lbs with no back pressure". This means that the spring tension of the relief valve would need to be 300 lbs in order to relieve the pressure of 1800 psi. The ball seat area of 1/6 sq. in is not relevant to determining the spring tension.

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• 10.

### (405) A manual poppet-type selector valve is in a working position when the camshaft is rotated to

• A.

Seat all forur poppets

• B.

Seat both of the pressure poppets

• C.

Unseat one pressure poppet and one return

C. Unseat one pressure poppet and one return
Explanation
The correct answer is "unseat one pressure poppet and one return." This means that when the camshaft is rotated, it causes one pressure poppet and one return poppet to become unseated. This action allows fluid to flow through the valve in a specific direction, depending on the design and configuration of the valve.

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• 11.

### (406)  What type of actuator has characteristic  of the travel of the piston will slow down when the piston nears either end of the cylinder?

• A.

Tandem

• B.

Internal locking

• C.

Internal snubber

C. Internal snubber
Explanation
An internal snubber is a type of actuator that has the characteristic of slowing down the travel of the piston when it nears either end of the cylinder. This is achieved through the use of internal mechanisms that provide resistance or dampening effect, reducing the speed of the piston as it reaches the ends of the cylinder. This helps to prevent abrupt stops or impacts, ensuring smoother and more controlled movement of the actuator.

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• 12.

### (406)  The difference between the a selector valve and a servo valve is that the

• A.

Selector valve has four ports

• B.

Servo valve will control fluid flow

• C.

Servo valve is electrically operated

B. Servo valve will control fluid flow
Explanation
The explanation for the given correct answer is that a servo valve is designed to control the flow of fluid, whereas a selector valve is not specifically designed for control, but rather for selecting between different fluid flow paths. A servo valve is typically used in systems where precise control of fluid flow is required, and it is often electrically operated to provide accurate and responsive control.

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• 13.

### (406)  How is the selector valve in anonautomatic hydraulic actuating system controlled?

• A.

By microswitches

• B.

By mechanical sequencing

• C.

Manually by the operated

C. Manually by the operated
Explanation
The selector valve in an automatic hydraulic actuating system is controlled manually by the operator. This means that the operator is responsible for manually selecting and operating the valve to control the flow of hydraulic fluid. This allows the operator to manually control the system and make adjustments as needed.

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• 14.

### (406)  In an electrical follow up system, the follow up action will catch up and neutralize the servo valve when the

• A.

Input and followup transducers send the same signal to the amplifier

• B.

Input and follow up transducers send the signal to the servo valve

• C.

Servo valve and amplifier send the same signal to the unput transducer.

A. Input and followup transducers send the same signal to the amplifier
Explanation
In an electrical follow-up system, the input and follow-up transducers send the same signal to the amplifier. This means that both transducers are measuring the same parameter and sending the same information to the amplifier. The amplifier then processes this signal and sends it to the servo valve. By having the input and follow-up transducers send the same signal to the amplifier, the system ensures that the follow-up action will catch up and neutralize the servo valve effectively.

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• 15.

### (406)  When a power control cylinder is in the manual mode, what compnent allows the fluid to flow from one side of the main actuator to the other

• A.

Solenoid operated shutoff valve

• B.

Bypass valve

• C.

Servo ram

B. Bypass valve
Explanation
When a power control cylinder is in manual mode, the bypass valve allows the fluid to flow from one side of the main actuator to the other. The bypass valve acts as a pathway for the fluid to bypass the main actuator, allowing for manual control of the power control cylinder.

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• 16.

### (407)  Which type of orifice allows normal speed of operation in one direction, but limits speed in the other

• A.

Fixed

• B.

Variable

• C.

Check valve

C. Check valve
Explanation
A check valve is a type of orifice that allows normal speed of operation in one direction, but limits speed in the other direction. It is designed to allow fluid flow in one direction while preventing backflow in the opposite direction. This is achieved through a valve mechanism that opens when the fluid flows in the desired direction and closes when there is reverse flow or pressure. As a result, the check valve acts as a speed limiter, allowing fluid to flow freely in one direction but restricting its flow in the opposite direction.

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• 17.

### (407)  Hydraulic flow regulators regulate fluid flow

• A.

In both directions

• B.

In one direction

• C.

Only when there is macimum load on the actuator

B. In one direction
Explanation
Hydraulic flow regulators are devices that control the flow of fluid in a hydraulic system. They are designed to regulate the flow in one specific direction, allowing fluid to pass through in that direction while restricting or blocking flow in the opposite direction. This helps to control the speed and pressure of the fluid in the system, ensuring that it flows smoothly and efficiently. Therefore, the correct answer is "in one direction."

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• 18.

### (408)  If we needed to lower system pressure to a subsystem to prevent an actuator from overloading the airframe, what hydraulic valve would we need?

• A.

Relief

• B.

Flow control

• C.

Pressure reducer

C. Pressure reducer
Explanation
A pressure reducer hydraulic valve would be needed in this scenario to lower the system pressure to a subsystem. This valve is designed to regulate and decrease the pressure of the hydraulic fluid flowing through it, which would help prevent the actuator from overloading the airframe.

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• 19.

### (408)  What is the purpose of installing sequence valves in a system?

• A.

So only one system can operate at a time.

• B.

To ensure that system actuators extend and retract at the same rate

• C.

So one operation is performed before the rest of the system can operate

C. So one operation is performed before the rest of the system can operate
Explanation
Sequence valves are installed in a system to ensure that one operation is performed before the rest of the system can operate. This helps in maintaining a specific order or sequence of operations, preventing simultaneous or undesired actions. By controlling the flow of fluid, sequence valves allow for a systematic and organized functioning of the system, ensuring that each operation is completed before the next one begins.

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• 20.

### (408)  In a typical electrically sequenced system, what unit is used to ensure proper sequencing?

• A.

Microswitch

• B.

Thermal switch

• C.

Priority valve

A. Microswitch
Explanation
In a typical electrically sequenced system, a microswitch is used to ensure proper sequencing. A microswitch is a small mechanical switch that is activated by a physical force, such as a lever or button. It is commonly used in control systems to detect and control the position or presence of an object. In the context of sequencing, a microswitch can be used to detect the completion of one task before initiating the next, ensuring that the system operates in the correct sequence.

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• 21.

### (408)  How long should you perform a leakage test on a swivel joint?

• A.

2 min

• B.

10 min

• C.

20 min

A. 2 min
Explanation
A leakage test on a swivel joint should be performed for 2 minutes. This duration allows enough time to detect any potential leaks in the joint without wasting excessive time. It strikes a balance between ensuring the joint's integrity and efficiency in completing the test. A shorter duration may not provide enough time to identify leaks accurately, while a longer duration may be unnecessary and time-consuming.

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• 22.

### (409)  In the hydraulic power system, when electrical power is lost, what will be the position of the soleniod operated shutoff valves?

• A.

Open

• B.

Closed

• C.

Bypass

A. Open
Explanation
In a hydraulic power system, solenoid-operated shutoff valves are designed to close when electrical power is lost. This is because the solenoid, which controls the opening and closing of the valve, requires electrical power to function. Therefore, when the electrical power is lost, the solenoid cannot operate and the shutoff valves will automatically close to prevent any fluid flow.

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• 23.

### (409)  In an emergency, the shutoff valves of the engine- driven hydraulic pump may be operated by

• A.

Stopping the engines

• B.

Pulling the fire handles

• C.

Pulling the circuit breakers

B. Pulling the fire handles
Explanation
In an emergency, pulling the fire handles is the correct way to operate the shutoff valves of the engine-driven hydraulic pump. This is because pulling the fire handles will activate the fire suppression system, which includes shutting off the fuel flow to the engines and cutting off the hydraulic pump. This action helps to prevent further damage or potential fire hazards in the event of an emergency.

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• 24.

### (409)  Refer to foldout 1.  If the fire control handle on No. 3 engine is pulled and the suction shutoff valve closes, but the pressure shutoff valve does not close, which component would yo suspect of being faulty

• A.

Suction shutoff valve

• B.

No. 3 engine relay

• C.

Pressure shutoff valve

C. Pressure shutoff valve
Explanation
If the fire control handle on No. 3 engine is pulled and the suction shutoff valve closes but the pressure shutoff valve does not close, it suggests that the pressure shutoff valve is faulty. The fire control handle is designed to shut off both the suction and pressure valves in order to stop the flow of fuel to the engine during a fire. If the suction shutoff valve is closing properly but the pressure shutoff valve is not, it indicates that there is an issue with the pressure shutoff valve specifically.

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• 25.

### (410) When the pump low pressure warning light comes on while the engines are running and the pressure reading on the accumulator pressure gauge reads low, the first component that should be suspected if having a malfunction is the

• A.

Snubber

• B.

Accumulator

• C.

Engine driven pump

C. Engine driven pump
Explanation
When the pump low pressure warning light comes on and the pressure reading on the accumulator pressure gauge reads low, it indicates that there is a problem with the pump system. The engine driven pump is responsible for maintaining the pressure in the system, so it is the first component that should be suspected of malfunctioning. The low pressure warning light and low pressure reading on the gauge suggest that the pump is not functioning properly, causing a decrease in pressure. Therefore, the engine driven pump is the most likely component to be causing the issue.

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• 26.

### (410)  With the engine shutdown,  one of the engine pumps low-pressure warning lights fails to come on, what would be the first thing yopu should check?

• A.

Faulty bulb

• B.

Internal leakage in vavlve

• C.

Press to test frature of the bulb

C. Press to test frature of the bulb
Explanation
The first thing you should check is the press to test feature of the bulb. This means that you need to press the bulb to see if it lights up, indicating that it is functioning properly. If the bulb does not light up, then it is likely faulty and needs to be replaced. This is important because the low-pressure warning light is crucial for indicating any issues with the engine pump, and a faulty bulb could lead to a failure in detecting potential problems.

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• 27.

### (411)  When filling a system reservoir, you must obseve the fluid level, because overfilling may cause the reservoir to

• A.

Vent

• B.

Rupture

• C.

Overheat

B. Rupture
Explanation
Overfilling the system reservoir can cause it to rupture. When the reservoir is filled beyond its capacity, the excess fluid puts pressure on the walls of the reservoir, potentially causing it to burst. This can lead to fluid leakage and damage to the surrounding components of the system. Therefore, it is important to observe the fluid level and avoid overfilling to prevent any potential rupture of the reservoir.

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• 28.

### (411)  When bleeding a power system, how much additional fluid should you bleed out after air bubbles are no longer evident

• A.

One quart

• B.

One-half quart

• C.

One gallon

A. One quart
Explanation
After bleeding the power system and removing air bubbles, it is recommended to bleed out an additional one quart of fluid. This is necessary to ensure that all air pockets are completely eliminated from the system, as even small amounts of air can cause issues with the system's performance and efficiency. Bleeding out this additional amount of fluid helps to ensure that the power system is properly filled and functioning optimally.

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• 29.

### (412)  When taking fluid samples on a hydraulic system  that does not have bleeder ports, you should

• A.

Remove and replace the filters

• B.

Take the sample from the reservoir only

• C.

Open line connections to take the sample

C. Open line connections to take the sample
Explanation
When taking fluid samples on a hydraulic system that does not have bleeder ports, it is necessary to open line connections to take the sample. This is because without bleeder ports, there is no other way to access the fluid in the system. By opening line connections, the fluid can be extracted for sampling purposes. Removing and replacing the filters or taking the sample from the reservoir only would not provide an accurate representation of the fluid within the system.

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• 30.

### If a hydraulic system is found to be contaminated, where should you begin draining the affected system?

• A.

Brakes

• B.

Reservoir

• C.

Flap actuators

B. Reservoir
Explanation
If a hydraulic system is found to be contaminated, draining the affected system should begin with the reservoir. The reservoir is the primary storage tank for hydraulic fluid in a hydraulic system. By draining the reservoir first, any contaminated fluid can be removed and replaced with clean fluid, preventing further contamination of the system. Additionally, draining the reservoir allows for inspection and cleaning of the reservoir itself, ensuring that it is free from any debris or contaminants that could potentially cause further issues in the system.

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• 31.

### (413)  when testing a newly-overhauled pump on the hydraulic test stand, why should the pump have a break in period?

• A.

Ensure proper operattion at all pressure and revolutions per minute settings

• B.

Ensure that fluid in the test stand is properly heated

• C.

Provide a check of leakage rate at the shaft seal

A. Ensure proper operattion at all pressure and revolutions per minute settings
Explanation
The break-in period is necessary to ensure proper operation of the newly-overhauled pump at all pressure and revolutions per minute settings. During this period, the pump is run at various speeds and pressures to allow the components to settle into their proper positions and ensure that they are functioning correctly. This helps to identify any potential issues or malfunctions before the pump is put into regular use, ensuring its reliability and efficiency.

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• 32.

### (413)  When bench checking a hydraulic pump, which test will indicate the amount of torque required to turn the pump driveshaft?

• A.

Capacity test

• B.

Static test

• C.

Drive shaft torque test

C. Drive shaft torque test
Explanation
The drive shaft torque test is the appropriate test to determine the amount of torque required to turn the pump driveshaft. This test specifically focuses on measuring the torque needed to rotate the driveshaft, providing valuable information about the pump's performance and efficiency. By conducting this test during bench checking, technicians can ensure that the pump is functioning properly and meets the required torque specifications.

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• 33.

### (414)  Which test should you perform to determineif the seals on the piston of an accumulator are leaking?

• A.

Proof pressure test

• B.

Internal leakage test

• C.

External leakage test

• D.

Piston seizure

B. Internal leakage test
Explanation
To determine if the seals on the piston of an accumulator are leaking, you should perform an internal leakage test. This test involves pressurizing the accumulator and then monitoring the pressure over a period of time. If the pressure decreases significantly, it indicates that there is internal leakage in the seals. This test helps to identify any potential issues with the seals and allows for timely maintenance or replacement to prevent further damage or failure of the accumulator.

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• 34.

### (414)  When accomplishing a piston seizure test on a hydraulic accumulator, hydraulic pressure should not exceed

• A.

50 psig

• B.

100 psig

• C.

1500 psig

A. 50 psig
Explanation
When accomplishing a piston seizure test on a hydraulic accumulator, it is important to ensure that the hydraulic pressure does not exceed 50 psig. This is because exceeding this pressure limit can result in a piston seizure, which can cause damage to the hydraulic system. Keeping the pressure below 50 psig ensures that the test is conducted safely and prevents any potential issues or damage.

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• 35.

### (414) While performing an internal leakage test, you notice air bubbles coming out of the accumulator end cap.  This indicates that

• A.

Excessive gas pressure is being applied

• B.

The accumulator is not properly vented

• C.

The end cap is leaking

• D.

The piston is leaking

D. The piston is leaking
Explanation
If air bubbles are coming out of the accumulator end cap during an internal leakage test, it indicates that the piston is leaking. The piston is responsible for separating the gas and liquid in the accumulator, and if it is leaking, it allows gas to escape into the liquid side, causing air bubbles to be released from the end cap. This suggests that there is a problem with the piston's seal or integrity, leading to the leakage.

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• 36.

### (415)  The purpose of the proof pressure test while bench checking a reservoir is to check for

• A.

Deformation/ failure

• B.

Internal leakage

• C.

Piston leakage

A. Deformation/ failure
Explanation
The purpose of the proof pressure test while bench checking a reservoir is to check for deformation/failure. This test is conducted to ensure that the reservoir can withstand the maximum pressure it is designed for without any structural damage or failure. By subjecting the reservoir to a higher pressure than its normal operating pressure, any potential deformations or failures can be identified and addressed before the reservoir is put into service. This test helps ensure the reliability and safety of the reservoir during its operation.

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• 37.

### (415)  The purpose of the fluid quantity system test is to test the

• A.

Pressurization system

• B.

Indication system

• C.

Nitrogen system

B. Indication system
Explanation
The purpose of the fluid quantity system test is to test the indication system. This system is responsible for providing accurate and reliable information about the fluid levels in various components of the system. By testing the indication system, the functionality and accuracy of the fluid level indicators can be verified. This is important for ensuring the safe and efficient operation of the fluid quantity system, as it allows operators to monitor and maintain appropriate fluid levels during operation.

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• 38.

### (416)  What valve prevents door operation while the main gears are in transit?

• A.

Control

• B.

Relief

• C.

Shutoff

C. Shutoff
Explanation
The shutoff valve prevents door operation while the main gears are in transit. This valve is designed to stop the flow of fluid or gas, effectively shutting off any movement or operation. In this case, it is specifically used to prevent the doors from being operated while the main gears are in motion or being transported.

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• 39.

### (417)  During a landing gear operational check, the main and nose gears fail to retract.  You've determined that hydraulic pressure is available.  What valve on the landing gear would be the probable cause?

• A.

Selector

• B.

Control

• C.

Sequence

A. Selector
Explanation
The probable cause for the main and nose gears failing to retract during a landing gear operational check, despite having hydraulic pressure available, is likely to be the selector valve on the landing gear. The selector valve is responsible for directing the hydraulic pressure to the appropriate gear for operation, such as extending or retracting the landing gear. If the selector valve is faulty or not functioning properly, it may prevent the hydraulic pressure from reaching the main and nose gears, resulting in their failure to retract.

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• 40.

### (417)  What would you use to remove the sleeve from a selector valve body?

• A.

Magnet

• B.

Brass dowel

• C.

Wooden dowel

C. Wooden dowel
Explanation
A wooden dowel would be used to remove the sleeve from a selector valve body. This is because a wooden dowel is a non-abrasive and non-magnetic tool that can be used to gently tap or push the sleeve out of the valve body without causing any damage. The wooden dowel is preferred over a brass dowel or magnet in this case because it is less likely to scratch or magnetically attract any metal components, ensuring a safe and effective removal process.

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• 41.

### (419)  Nose wheel steering shimmy dampening is effective when the valve plunger is in

• A.

Extend

• B.

Retract

• C.

Neutral

C. Neutral
Explanation
Nose wheel steering shimmy dampening is effective when the valve plunger is in the neutral position. This means that the valve is neither extended nor retracted. In this position, the valve is able to effectively dampen any vibrations or oscillations in the nose wheel steering system, preventing shimmying.

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• 42.

### (420)  If the aircraft tends to steer only to the left, which statement is not a probable cause?

• A.

Dragging brakes

• B.

Shock strut conical bearings binding

• C.

Metering valve malfunction

B. Shock strut conical bearings binding
Explanation
The statement "shock strut conical bearings binding" is not a probable cause for the aircraft tending to steer only to the left. The shock strut conical bearings are responsible for absorbing shocks and providing stability to the landing gear, but they do not directly affect the steering of the aircraft. Dragging brakes and a metering valve malfunction can both cause the aircraft to steer to one side, as they can create uneven braking forces or affect the hydraulic system that controls the steering.

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• 43.

### (421)  During landing-gear retraction, what unit applies the brakes to stop wheel spin?

• A.

Automatic brake actuator

• B.

Copilot's metering valve

• C.

Copilot's brake pedals

A. Automatic brake actuator
Explanation
During landing-gear retraction, the automatic brake actuator applies the brakes to stop wheel spin. This unit is responsible for automatically engaging the brakes when the landing gear is being retracted to prevent the wheels from spinning freely. The automatic brake actuator ensures that the wheels are properly controlled and do not rotate excessively during the retraction process, enhancing the safety and stability of the aircraft.

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• 44.

### (421)  In the event a brake line ruptures and the hydraulic fuse sets, how much hydraulic fluid( in cubic inches) will be lost?

• A.

10(+5/-0)

• B.

20(+10/-0)

• C.

40(+10/-0)

C. 40(+10/-0)
Explanation
If a brake line ruptures and the hydraulic fuse sets, it means that the hydraulic fuse will activate and stop the flow of hydraulic fluid. Therefore, the amount of hydraulic fluid lost will depend on the size of the brake line and the pressure at which the hydraulic system operates. Since the answer is 40(+10/-0) cubic inches, it suggests that in this scenario, approximately 40 cubic inches of hydraulic fluid will be lost.

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• 45.

### (422)  During a postflight debriefing, the pilot reports that the antiskid is completely inopertive.  Upon inspection you find that the antiskid switch is ON, and all circuit breakers are engaged. What would be the next component to be checked

• A.

Brake pedals

• B.

The accumulator

• C.

Antiskid control box

C. Antiskid control box
Explanation
The next component to be checked would be the antiskid control box. Since the antiskid switch is ON and all circuit breakers are engaged, the issue is likely with the control box itself. By inspecting the control box, it can be determined if there is a malfunction or any other issue that is causing the antiskid system to be completely inoperative.

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• 46.

### (423)  During the testing of a brake assembly, you reduce the pressure to 75psi, what are you simulating?

• A.

Back Pressure

• B.

Static Pressure

• C.

Emergency Pressure

A. Back Pressure
Explanation
Reducing the pressure to 75psi during the testing of a brake assembly simulates back pressure. Back pressure refers to the resistance or force exerted against the normal flow of fluid or gas in a system. In the context of a brake assembly, back pressure simulates the resistance or force that occurs when the brakes are applied, mimicking real-world conditions and allowing for accurate testing and evaluation of the brake system's performance.

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• 47.

### (424)  In the aircraft's roll axis, what system compensates for imbalance or external enviromental conditions that affects stabilized flight?

• A.

Mechanical

• B.

Elecrical

• C.

Trim

C. Trim
Explanation
The trim system in the aircraft's roll axis compensates for any imbalance or external environmental conditions that affect stabilized flight. This system helps to adjust the aircraft's control surfaces to maintain a desired attitude and reduce the pilot's workload. By making small adjustments to the trim, the aircraft can counteract any imbalances or external factors that may cause it to roll off course, ensuring a more stable and controlled flight.

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• 48.

### (424)  What component improves stick feel characteristics and reduces undersirable structural coupling oscillations?

• A.

Roll damper

• B.

Yaw damper

• C.

A. Roll damper
Explanation
The roll damper is the component that improves stick feel characteristics and reduces undesirable structural coupling oscillations. The roll damper helps to stabilize the aircraft during roll movements and reduces the effects of structural vibrations or oscillations that can occur during flight. By dampening these oscillations, the roll damper improves the overall feel and control of the aircraft, providing a smoother and more stable flying experience.

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• 49.

### (424)  What surface is used to augment the ailerons to achieve the roll rate commanded either by the pilot or copilot?

• A.

Elevator

• B.

Rudder

• C.

Spoiler

C. Spoiler
Explanation
Spoilers are used to augment the ailerons to achieve the roll rate commanded by the pilot or copilot. Spoilers are surfaces located on the wings that disrupt the airflow over the wings, reducing lift and increasing drag. By deploying spoilers on one wing while retracting them on the other, the aircraft can roll in the desired direction. This helps in controlling the roll motion of the aircraft during maneuvers and allows for precise control of the aircraft's bank angle.

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• 50.

### (425)  What component ensures that areodynamic loads push the spoiler panel to retract in the event of hydraulic system failure?

• A.

Electro-hydraulic Servo Valve, second stage.

• B.

Electro-hydraulic Servo Valve, first stage.

• C.

A. Electro-hydraulic Servo Valve, second stage.
Explanation
The correct answer is Electro-hydraulic Servo Valve, second stage. The second stage of the electro-hydraulic servo valve ensures that aerodynamic loads push the spoiler panel to retract in the event of hydraulic system failure. This component is responsible for controlling the flow of hydraulic fluid to the spoiler panel, allowing it to retract when necessary.

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