2A656 CDC 4

1. (603) When installing air-conditioning ducting, what tool is used to ensure alignment and sealing?

Screwdriver.

Center punch.

Rawhide mallet.

Ball peen hammer.

2. (604) Leaks can best be detected during an operational check of the bleed air distribution system by

Listening and feeling.

Using an ultrasonic leak detector only.

Feeling only because leaking air may be hot.

Listening only because leaking air may be at high pressure.

3. (603) Which lubricant can be used on a beaded channel clamp sleeve to ease installation?

Soap

Water

Grease

Silicone

4. (607) What air source ventilates the cockpit when smoke or fumes are discharged from the air-conditioning system?

Liquid air.

Compressed air.

Conditioned air.

Atmospheric air.

5. (603) What important fact must you remember when replacing gaskets used in aircraft ducting?

Only replace gaskets if they are distorted.

Always replace a gasket each time it is removed.

Only replace gaskets in high-pressure/high-temperature ducting.

Always reuse a gasket because it is already shaped to fit the ducts.

6. (601) Each of these examples of aircraft systems use engine bleed air except

Anti-G.

Anti-icing.

Rain removal.

Fire extinguishing.

7. (606) An aircraft's bleed air cooling air system pre-cooler is also known as the

Air cycle machine.

Contained air cooler.

Primary heat exchanger.

Regenerative temperature changer.

8. (606) Some cooling turbines have a pair of unused wires that are cut-off close to the turbine housing. What level of maintenance uses these wires?

Depot.

Squadron.

Intermediate.

Organizational.

9. (603) What corrective action should be taken when a compressible flange duct end becomes distorted?

Replace the duct flange ends.

Use a gasket with the duct ends.

Reposition the duct for better sealing.

Reshape the duct flange ends to its original shape.

10. (601) Engine bleed air check valves are installed to

Prevent the loss of bleed air.

Provide a primary source for bleed air.

Maintain a balance airflow from each engine.

Reduce bleed air pressure when the pressure is to high.

11. (611) The anti-G suit prevents

Blood from rushing to the brain.

A restricted flow of blood to the heart.

Blood from pooling in the lower portions of the body.

Overexertion of the heart when G-forces are encountered.

12. (606) One purpose of the fan in the bleed air system cooling turbine and fan assembly is to prevent

Excessive air flow.

Low system pressure.

Turbine over speeding.

Moisture in the cold air.

13. (608) What air-conditioning component prevents excessive moisture from reaching the cockpit of a fighter aircraft?

Defog valve.

Anti-ice valve.

Water separator.

Cabin dual-temperature mixing valve.

14. (608) The temperature of conditioned air going to the crew compartment depends on the position of the

Cabin air inlet valve.

Ground cooling ejector valve.

Water separator bypass valve.

Cabin dual-temperature mixing valve.

15. (601) The engine section from which bleed air is usually taken is the

Intake.

Turbine.

Exhaust.

Compressor.

16. (616) Which pressurization range maintains a constant cabin pressure?

Isobaric.

Differential.

Unpressurized.

Dual differential.

17. (606) To create a greater cooling effect, atomized water is sprayed across the inlet of the bleed air system secondary heat exchanger by the

Jet pump.

Jet sprayer.

Water aspirator.

Water separator.

18. (604) You perform a bleed air system leakage check using the pressure decay method with an aircraft engine; the time for the pressure to drop 30 pounds per square inch (psi) took 11 seconds.This indicates that the system leakage test

Needs to be repeated.

Results are dangerously excessive.

Results are below allowable limits.

Results are within allowable limits.

19. (602) What is the pressure and flow control device that restricts airflow and protects aircraft engines against air starvation?

Orifice.

Air regulator.

Pressure limiter.

Pressure regulator.

20. (611) The purpose of the anti-G suit system is to supply air pressure to

Inflate the pilot’s anti-G suit.

Exert pressure on the pilots lungs.

Offset the effects of negative G-forces.

Prevent blood from rushing to the pilot’s brain.

21. (607) Bleed air system water separators remove 70 to 85 percent of the moisture that accumulates in the conditioned air. This is accomplished as a result of

Rapid expansion.

Regulated airflow.

Internal compression.

Regulated air pressure.

22. (603) While installing a bleed air system bolted flanged face duct end, you use a new crush-type gasket, align the flange, and insert the bottom bolts first to form a cradle. Then, you install the remaining bolts and tighten all the nuts. After the installation is complete you perform an operational check that reveals a leak. From the above information what important procedure did you overlook?

A sealing compound was not used with the gaskets.

Flange bolts were not torqued in the proper sequence.

The flange was not tapped with a rawhide mallet while torquing.

Gasket should have been installed before cradle bolts were installed.

23. (618) Components that are susceptible to separating from an aircraft during a ground pressure test

Double locked.

Anchored with a chain.

Tied with a net or strap.

Removed before testing.

24. (602) What happens if electrical power is interrupted to the solenoid of an electrically-controlled,pneumatically-operated air-conditioning system shutoff valve that has a fail-safe feature?

The valve opens.

The valve closes.

If closed, the valve opens; if open, the valve closes.

The valve opens or closes depending on system design requirements.

25. (610) Pressure to the floor heat ejector on a cargo aircraft floor heat system is regulated by the

Floor heat shutoff valve.

Pneumatic control thermostat.

Pneumatic temperature anticipator.

Floor heat modulating and shutoff valve.

26. (607) The bleed air system water separator anti-icing system prevents the condenser bag from icing by keeping the turbine

Inlet temperature above 32°.

Inlet temperature below 32°.

Outlet temperature above 32°.

Outlet temperature below 32°.

27. (602) The lockout butterfly of the airflow regulator has an offset center of rotation. This design gives the butterfly a pressure that is unbalanced towards which position?

Open.

Closed.

Locked.

Unlocked.

28. (602) Due to a loss of energy, the outlet air pressure of an orifice is

Lower than the inlet.

Higher than the inlet.

Lower than the throat.

The same as the throat.

29. (606) The bleed air pre-cooler assembly maintains a constant outlet temperature with the aid of a

Sensor, modulating valve, and jet pump. sensor, temperature control circuit, and jet pump.

Sensor, temperature control circuit, and jet pump.

Modulating valve, sensor, and temperature control circuit.

Modulating valve, temperature control circuit, and jet pump.

30. (605) The small drill hole in the outlet of some engine bleed air shutoff valves serves to

Check the valve position.

Connect a pressure gage.

Relieve excess pressure.

Secure valve insulation.

31. (603) Expansion joints in bleed air systems are best used on

Ram air ducting.

Long runs of ducting.

Low-pressure ducting.

Short runs of ducting.

32. (601) Aircraft engine temperature and pressure as it applies to the bleed air system is determined by the

Ambient pressure and ambient temperature.

Ambient pressure and engine throttle setting.

Engine throttle setting and ambient altitude.

Engine throttle setting and ambient temperature

33. (614) A portion of the bleed air used for wing anti-icing is dumped overboard, the remaining air

Controls the modulating valve.

Returns to the jet pump as recirculating air.

Becomes a reference temperature for the thermostat.

Assists the ejector nozzles in drawing air across the heat exchanger.

34. (614) In the bleed air anti-icing system, the engine bleed air supply duct has a distribution duct (piccolo tube) that may be attached to the leading edge section. If it is, then what must happen to replace the tube?

Can only be replaced at depot level.

Remove tube through the wing butt access panel.

Remove tube through the trailing edge access panels.

Leading edge section must be removed to replace the tube.

35. (611) What is the maximum G force that the average pilot can withstand when wearing an anti-G suit?

4–5 Gs.

6–7 Gs.

8–9 Gs.

10–11 Gs.

36. (610) On a cargo type aircraft, the function of the floor heat system pneumatic anticipator is to

Control the floor heat shutoff valve.

Respond to rapid temperature changes.

Respond to gradual temperature changes.

Send a signal to the control box amplifier section.

37. (606) A pre-cooler assembly is usually a self-contained cooling package with its own

Flow control system.

Safety control system.

Pressure control system.

Temperature control system.

38. (603) What type of high-pressure/high-temperature ducting does not require a gasket?

Clamp flange.

Bolted flange.

Beaded flange.

Compressible flange.

39. (602) The amount of airflow through a pressure limiter is effected by each of these except

Inlet pressure.

Outlet pressure.

Inlet temperature.

Differential pressure.

40. (602) What component stops the flow of air to the air-conditioning system?

Pressure limiter.

Flow control valve.

Air regulator valve.

System shutoff valve.

41. (602) To remedy the limitations of a flow control valve, which bleed air system component is usually installed upstream of the flow control valve?

Metering valve.

Pressure limiter.

System shutoff valve.

Pressure regulator and shutoff valve.

42. (609) The water separator over temperature switch actuates at

175 ± 20 (°F).

175 ± 10°F.

155 ± 20°F.

155 ± 10°F.

43. (605) Low engine pressure ratio (EPR) could be caused by a bleed air system that has

An orifice that is defective.

A clamp that has been improperly installed.

A precooler air ejector valve that is defective.

A pressure regulator that is installed backwards.

44. 24. (604) Bleed air leaks are permissible

Around valve shafts.

At low-pressure connections.

Before the bleed air engine tapoff.

On the bleed air ducting center wing section.

45. The cargo aircraft temperature control component that produces an electrical signal that causes the temperature control valve to increase or decrease compartment temperature as required to correct an unbalanced bridge condition is the temperature control

Box.

Sensor.

Limiter.

Rheostat.

46. (602) The flow control valve control in the bleed air air-conditioning system controls flow by maintaining a constant differential pressure between the

Inlet and throat of the venturi.

Outlet and throat of the venturi.

Outlet and inlet of the venturi.

Inlet, outlet, and throat of the venturi.

47. (617) The isobaric mechanism in the pressure controller consists of

An aneroid only.

A diaphragm only.

An aneroid and spring.

An aneroid and diaphragm.

48. (609) Bleed air inlet pressure is maintained at 40 pounds per square inch gage (psig—at sea level) on a bomber air-conditioning system (ACS) by the

Pressure limiter.

ACS flow control and shutoff valve.

ACS pressure regulator and shutoff valve.

Cabin temperature control system pressure regulator and shutoff valve.

49. (608) When a fighter aircraft air-conditioning system (ACS) is being operated on the ground, the ram air necessary to cool the bleed air flowing through the heat exchangers is provided by the

Airflow valve.

Ejector valve.

Ram air nozzle.

Air-to-air valve.

50. (618) What is the maximum allowable temperature of the air provided to the aircraft during a cabin leakage test?

100 °F.

110°F.

120°F.

130°F.

51. (607) The bleed air system component that causes the aircraft cooling turbine to slow down when an icing condition occurs is the

Turbine bypass valve.

Ice control screen.

Anti-icing valve.

Anti-icing controller.

52. (601) Which component determines the amount of bleed air bled from a gas turbine compressor (GTC)?

Themocouple.

Fuel control valve.

Load control valve.

Bleed air control governor.

53. (609) When pressure is high enough to cause a bomber air-conditioning expansion turbine to exceed 110 percent of its maximum operating speed, the

Cold air and flow control valves close.

Cabin temperature control system (CTCS) pressure regulator/shutoff and cold air valves close.

Flow control/shutoff and air conditioning system (ACS) pressure regulator/shutoff valves close.

ACS pressure regulator/shutoff and CTCS pressure regulator/shutoff valves close.

54. (602) The downstream air temperature of the bleed air air-conditioning system has exceeded the predetermined temperature. This has caused the butterfly to close. What flow control and shutoff valve component will now open?

Thermal switch.

Fusible switch.

Breakaway switch.

Pneumatic switch.

55. (616) The action of the outflow valve in a fixed-isobaric, single-differential pressurization system is controlled by

A jet pump.

Filtering cabin air.

The unpressurized range.

Regulating control chamber pressure.

56. (616) Which component provides the control by which the canopy seal is inflated and deflated in unison with the opening and closing of the canopy?

Bellcrank.

Check valve.

Bellows face plate.

Pressure regulator.

57. (606) Hot bleed air used for air-conditioning is cooled in a heat exchanger by

Ram air.

Rapid expansion.

Mixing bleed air with ram air.

Water flowing across the heat exchanger core.

58. (618) The timed pressure drop method determines cabin pressure leakage by measuring

The pressure decrease.

Pressure in pounds per minute.

Pressure in cubic feet per minute

How long pressure stabilization takes.

59. (618) When performing a cabin pressure leakage test using the flow rate test method, use a flowmeter to indicate the

Cabin air leakage.

Pressure in the cabin.

Output from the blower.

Rate of cabin pressure change.

60. (618) During the cabin leakage test operation, what step or steps should occur?

Place the selector valve in the neutral position when starting the tester.

Place the selector valve in the stop position when starting the tester.

61. (602) The air-controlling component that reduces high pressure engine bleed air to a lower constant pressure for the flow control valve is the

Butterfly valve.

Pressure limiter.

Pressure regulator.

System shutoff valve.

62. (617) Which condition would cause an aircraft to not pressurize?

Manual control valve stuck open.

Isobaric metering valve stuck closed.

Cabin pressure controller filter partially clogged.

The test valve handle is in the TEST ONLY-ALL OFF position.

63. (617) If one outflow safety valve opens when the aircraft starts to pressurize, you should check the corresponding

Pneumatic relay.

Rate metering valve.

Manual control valve.

Cabin pressure controller.

64. (612) If #4 and #5 non-electrostatic application (NESA) pilot's window are inoperative and #3 window is operating satisfactory, the probable cause is the

Thermal switch and wiring.

Sensing element and wiring.

Autotransformer and wiring.

Temperature controller and wiring.

65. (605) The bleed air pressure regulator is supplying the required pressure to the bleed air system, yet the cabin temperature is higher than normal. A system check indicates the cooling turbine is not receiving sufficient airflow to produce effective cooling. What would be the primary cause of the problem?

Pressure limiter.

Low system pressure.

Flow control valve.

High engine pressure ratio.

66. (617) Which component allows each cabin pressurization system outflow safety valve to operate at the same time and to be subject to the same pressure?

Poppet valve.

Pneumatic relay.

Rate control system.

Cabin pressure controller.

67. (615) During flight, in automatic, the air-conditioning system (ACS) is delivering only cold air,this malfunction could be caused by the

Thermostat.

Thermal switch.

Temperature sensor.

Temperature limiter.

68. (613) The windshield rain removal drain will open below what pressure?

5 psi.

7 psi.

9 psi.

11 psi.

69. (608) Which cabin safety device prevents a fighter air-conditioning system from overheating?

Overheat switch.

Temperature sensor.

Temperature control switch.

Manual temperature limiter.

70. (613) The venturi in the windshield rain removal system

Regulates airflow to the rain removal system.

Prevents the primary heat exchanger from overheating.

Provides an even distribution of bleed air across the windshields.

Assists the air-conditioning system in maintaining regulated airflow.

71. (610) The outlet bleed air temperature of the primary heat exchanger in a cargo air-conditioning system exceeds 540°F.When this happens, the high-limit section of the temperature anticipator sensor

Opens the cooling air valve.

Opens the ejector air valve.

Closes the primary heat exchanger shutoff valve.

Closes the bleed air pressure regulator and shutoff valve.

72. (608) How is the warning light in the cockpit activated if duct pressure on a fighter air conditioning system becomes excessive?

Turbine overspeed switch.

Cabin temperature limiter.

Manual temperature limiter.

Pneumatic-thermal overheat switch.

73. (614) Bleed air airflow through the anti-icing distribution tube is modulated by the control valve in response to temperature changes that are sensed by the

Thermal sensor.

Control circuit.

Temperature switch.

Pneumatic thermostat.

74. (605) An excessive pressure in the bleed air system can cause an unusually high cockpit temperature due to

A bleed air leak.

An over-speeding turbine.

High exhaust gas temperature.

A stuck open pressure relief valve.

2A656 CDC 4

1. (603) When installing air-conditioning ducting, what tool is used to ensure alignment and sealing?

2.

What first name or nickname would you like us to use?

2. (604) Leaks can best be detected during an operational check of the bleed air distribution system by

3. (603) Which lubricant can be used on a beaded channel clamp sleeve to ease installation?

4. (607) What air source ventilates the cockpit when smoke or fumes are discharged from the air-conditioning system?

5. (603) What important fact must you remember when replacing gaskets used in aircraft ducting?

6. (601) Each of these examples of aircraft systems use engine bleed air except

7. (606) An aircraft's bleed air cooling air system pre-cooler is also known as the

8. (606) Some cooling turbines have a pair of unused wires that are cut-off close to the turbine housing. What level of maintenance uses these wires?

9. (603) What corrective action should be taken when a compressible flange duct end becomes distorted?

10. (601) Engine bleed air check valves are installed to

11. (611) The anti-G suit prevents

12. (606) One purpose of the fan in the bleed air system cooling turbine and fan assembly is to prevent

13. (608) What air-conditioning component prevents excessive moisture from reaching the cockpit of a fighter aircraft?

14. (608) The temperature of conditioned air going to the crew compartment depends on the position of the

15. (601) The engine section from which bleed air is usually taken is the

16. (616) Which pressurization range maintains a constant cabin pressure?

17. (606) To create a greater cooling effect, atomized water is sprayed across the inlet of the bleed air system secondary heat exchanger by the

18. (604) You perform a bleed air system leakage check using the pressure decay method with an aircraft engine; the time for the pressure to drop 30 pounds per square inch (psi) took 11 seconds.This indicates that the system leakage test

19. (602) What is the pressure and flow control device that restricts airflow and protects aircraft engines against air starvation?

20. (611) The purpose of the anti-G suit system is to supply air pressure to

21. (607) Bleed air system water separators remove 70 to 85 percent of the moisture that accumulates in the conditioned air. This is accomplished as a result of

23. (618) Components that are susceptible to separating from an aircraft during a ground pressure test

24. (602) What happens if electrical power is interrupted to the solenoid of an electrically-controlled,pneumatically-operated air-conditioning system shutoff valve that has a fail-safe feature?

25. (610) Pressure to the floor heat ejector on a cargo aircraft floor heat system is regulated by the

26. (607) The bleed air system water separator anti-icing system prevents the condenser bag from icing by keeping the turbine

27. (602) The lockout butterfly of the airflow regulator has an offset center of rotation. This design gives the butterfly a pressure that is unbalanced towards which position?

28. (602) Due to a loss of energy, the outlet air pressure of an orifice is

29. (606) The bleed air pre-cooler assembly maintains a constant outlet temperature with the aid of a

30. (605) The small drill hole in the outlet of some engine bleed air shutoff valves serves to

31. (603) Expansion joints in bleed air systems are best used on

32. (601) Aircraft engine temperature and pressure as it applies to the bleed air system is determined by the

33. (614) A portion of the bleed air used for wing anti-icing is dumped overboard, the remaining air

34. (614) In the bleed air anti-icing system, the engine bleed air supply duct has a distribution duct (piccolo tube) that may be attached to the leading edge section. If it is, then what must happen to replace the tube?

35. (611) What is the maximum G force that the average pilot can withstand when wearing an anti-G suit?

36. (610) On a cargo type aircraft, the function of the floor heat system pneumatic anticipator is to

37. (606) A pre-cooler assembly is usually a self-contained cooling package with its own

38. (603) What type of high-pressure/high-temperature ducting does not require a gasket?

39. (602) The amount of airflow through a pressure limiter is effected by each of these except

40. (602) What component stops the flow of air to the air-conditioning system?

41. (602) To remedy the limitations of a flow control valve, which bleed air system component is usually installed upstream of the flow control valve?

42. (609) The water separator over temperature switch actuates at

43. (605) Low engine pressure ratio (EPR) could be caused by a bleed air system that has

44. 24. (604) Bleed air leaks are permissible

45. The cargo aircraft temperature control component that produces an electrical signal that causes the temperature control valve to increase or decrease compartment temperature as required to correct an unbalanced bridge condition is the temperature control

46. (602) The flow control valve control in the bleed air air-conditioning system controls flow by maintaining a constant differential pressure between the

47. (617) The isobaric mechanism in the pressure controller consists of

48. (609) Bleed air inlet pressure is maintained at 40 pounds per square inch gage (psig—at sea level) on a bomber air-conditioning system (ACS) by the

49. (608) When a fighter aircraft air-conditioning system (ACS) is being operated on the ground, the ram air necessary to cool the bleed air flowing through the heat exchangers is provided by the

50. (618) What is the maximum allowable temperature of the air provided to the aircraft during a cabin leakage test?

51. (607) The bleed air system component that causes the aircraft cooling turbine to slow down when an icing condition occurs is the

52. (601) Which component determines the amount of bleed air bled from a gas turbine compressor (GTC)?

53. (609) When pressure is high enough to cause a bomber air-conditioning expansion turbine to exceed 110 percent of its maximum operating speed, the

54. (602) The downstream air temperature of the bleed air air-conditioning system has exceeded the predetermined temperature. This has caused the butterfly to close. What flow control and shutoff valve component will now open?

55. (616) The action of the outflow valve in a fixed-isobaric, single-differential pressurization system is controlled by

56. (616) Which component provides the control by which the canopy seal is inflated and deflated in unison with the opening and closing of the canopy?

57. (606) Hot bleed air used for air-conditioning is cooled in a heat exchanger by

58. (618) The timed pressure drop method determines cabin pressure leakage by measuring

59. (618) When performing a cabin pressure leakage test using the flow rate test method, use a flowmeter to indicate the

60. (618) During the cabin leakage test operation, what step or steps should occur?

61. (602) The air-controlling component that reduces high pressure engine bleed air to a lower constant pressure for the flow control valve is the

62. (617) Which condition would cause an aircraft to not pressurize?

63. (617) If one outflow safety valve opens when the aircraft starts to pressurize, you should check the corresponding

64. (612) If #4 and #5 non-electrostatic application (NESA) pilot's window are inoperative and #3 window is operating satisfactory, the probable cause is the

66. (617) Which component allows each cabin pressurization system outflow safety valve to operate at the same time and to be subject to the same pressure?

67. (615) During flight, in automatic, the air-conditioning system (ACS) is delivering only cold air,this malfunction could be caused by the

68. (613) The windshield rain removal drain will open below what pressure?

69. (608) Which cabin safety device prevents a fighter air-conditioning system from overheating?

70. (613) The venturi in the windshield rain removal system

71. (610) The outlet bleed air temperature of the primary heat exchanger in a cargo air-conditioning system exceeds 540°F.When this happens, the high-limit section of the temperature anticipator sensor

72. (608) How is the warning light in the cockpit activated if duct pressure on a fighter air conditioning system becomes excessive?

73. (614) Bleed air airflow through the anti-icing distribution tube is modulated by the control valve in response to temperature changes that are sensed by the

74. (605) An excessive pressure in the bleed air system can cause an unusually high cockpit temperature due to