B737 System Validation Question Bank – Air Systems R1

Front 1

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Back 1

Check back for future revisions!

Front 2

1. Where does APU bleed air enter the pneumatic manifold?
a. Left of the Isolation Valve
b. Right of the Isolation Valve
c. Both sides of the Isolation Valve

Back 2

a. Left of the Isolation Valve

Front 3

2. Where does the external pneumatic air enter the pneumatic manifold?
a. Left of the Isolation Valve
b. Right of the Isolation Valve
c. Both sides of the Isolation Valve

Back 3

b. Right of the Isolation Valve

Front 4

3. What are all the sources that provide air for the pneumatic system?
a. External air and engine bleeds
b. APU, 5th, and 9th stage engine bleeds
c. External, APU and 5th and 9th stage engine bleeds

Back 4

c. External, APU and 5th and 9th stage engine bleeds

Front 5

4. An 800 aircraft has three air conditioning control zones. The temperature controllers are in NORMAL and trim air is ON. The two packs will supply air at what temperature?
a. An average temperature for all three zones
b. An average temperature for the FWD CAB and AFT CAB
c. A temperature for the zone requiring the most cooling
d. A temperature for the zone requiring the most warmth

Back 5

c. A temperature for the zone requiring the most cooling

Front 6

5. What happens when an engine bleed switch is placed to ON?
a. If engine bleed air and electrical power are available, the valve opens
b. The valve will open if DC power but no air pressure is available to the valve
c. An electric motor opens the engine bleed valve

Back 6

a. If engine bleed air and electrical power are available, the valve opens

Front 7

6. What does an illuminated engine BLEED TRIP OFF light indicate?
a. Excessive engine bleed air pressure caution, engine bleed valve remains open
b. Excessive engine bleed air pressure or temperature advisory, engine bleed valve remains open
c. Excessive engine bleed air pressure or temperature caution, engine bleed valve closes automatically

Back 7

c. Excessive engine bleed air pressure or temperature caution, engine bleed valve closes automatically

Front 8

7. How is engine bleed air temperature regulated?
a. Controlled ambient ram air circulates through ha precooler
b. Controlled engine fan air circulates through a precooler
c. Controlled engine fan air mixes with engine bleed air

Back 8

b. Controlled engine fan air circulates through a precooler

Front 9

8. Which model 737 has an amber light on the overhead panel labeled PACK TRIP OFF?
a. 300 model
b. 800 model
c. 900 model

Back 9

a. 300 model

Front 10

9. Air for starting the engines is supplied from ________.
a. Between the respective engine bleed air valve & 5th stage low pressure bleed valve
b. Between the respective engine bleed air valve & 9th stage high pressure bleed valve
c. The left or right pneumatic manifold

Back 10

c. The left or right pneumatic manifold

Front 11

10. Which statements are correct regarding the pneumatic manifold pressure sensors?
a. DC powered; located in left & right 9th stage engine bleed lines
b. AC powered; located in left & right pneumatic manifolds
c. AC powered; located in left, right & center pneumatic manifolds after pack valve

Back 11

b. AC powered; located in left & right pneumatic manifolds

Front 12

11. What do the duct pressure pointers indicate when one pack valve switch is placed to OFF with the APU providing bleed air and the isolation valve in AUTO?
a. Only the left pointer indicates APU bleed pressure
b. Only the right indicates APU bleed pressure
c. APU bleed pressure shows on both pointers

Back 12

c. APU bleed pressure shows on both pointers

Front 13

12. What occurs when the APU bleed air switch is placed to ON?
a. DC power signals valve to open, APU bleed air opens the valve if RPM is above 95%
b. Normal AC bus power signals valve to open
c. No. 1 AC Transfer bus power operates the motor, which opens the valve

Back 13

a. DC power signals valve to open, APU bleed air opens the valve if RPM is above 95%

Front 14

13. What is the power source for the pneumatic isolation valve?
a. Battery bus
b. AC power
c. DC Standby bus

Back 14

b. AC power

Front 15

14. Which statement best describes the isolation valve function?
a. Isolates left engine bleed air duct from the APU bleed air duct and is closed during normal operation
b. Isolates right engine bleed air duct from the pneumatic ground air connection point and is open for engine start
c. Isolates left & right sides of the pneumatic manifold and is closed during normal operation

Back 15

c. Isolates left & right sides of the pneumatic manifold and is closed during normal operation

Front 16

15. What action causes the pneumatic isolation valve to open when the switch is in the AUTO position?
a. Engine bleed air loss or APU bleed switch placed to OFF
b. Placing an engine bleed air switch or pack switch to OFF
c. Engine bleed valve or pack valve trip off

Back 16

b. Placing an engine bleed air switch or pack switch to OFF

Front 17

16. What is the function of the DUAL BLEED light?
a. To warn when two engine bleeds are supplying one pack
b. To warn when 2 packs are operated from one bleed source
c. To warn when the APU may be back pressured by engine bleed air

Back 17

c. To warn when the APU may be back pressured by engine bleed air

Front 18

17. Which valve and switch combination causes the DUAL BLEED light to come on?
a. APU bleed & isolation valves OPEN, with engine bleed switches in the OFF position
b. Right & left engine bleed switches ON, with isolation valve OPEN and the APU bleed valve CLOSED
c. APU bleed valve OPEN & right engine bleed switch On, with the isolation valve OPEN

Back 18

c. APU bleed valve OPEN & right engine bleed switch On, with the isolation valve OPEN

Front 19

18. What is the crew action for an illuminated DUAL BLEED light prior to engine start?
a. Place external air switch to OFF before engine start
b. Place APU bleed air switch to OFF before engine start
c. Place engine bleed air switch to OFF before engine start
d. No action Dual Bleed Light is normal during engine start with APU bleed air

Back 19

d. No action Dual Bleed Light is normal during engine start with APU bleed air

Front 20

19. Which condition illuminates a WING-BODY OVERHEAT light?
a. Bleed air leak in the APU bleed air duct
b. Bleed air leak in the wind leading edge are inboard of the engine strut
c. Bleed air leak in the aircraft keel beam area
d. All answers are correct

Back 20

a. Bleed air leak in the APU bleed air duct

Front 21

20. Which duct pressure indication is acceptable for a 6-737-300 engine start at the Denver airport? (5431 ft. above sea level)
a. 28 psi
b. 25 psi
c. 23 psi

Back 21

a. 28 psi

Front 22

21. What engine stages provide bleed air?
a. The 5th and 9th stage
b. The 5th and 8th stage
c. The 6th and 8th stage
d. The 6th and 9th stage

Back 22

a. The 5th and 9th stage

Front 23

22. The 9th stage engine bleed air is the primary source of bleed air for pneumatics when the engine is at cruise thrust.
a. True
b. False

Back 23

b. False

Front 24

23. The engine bleed valves are located:
a. Upstream of the 8th stage modulations/shutoff valve
b. Upstream of the 9th stage modulations/shutoff valve
c. Downstream of the 9th stage modulations/shutoff valve

Back 24

c. Downstream of the 9th stage modulations/shutoff valve

Front 25

24. How are the bleed valves operated?
a. They are electrically controlled and operated
b. They are electrically controlled and pneumatically operated
c. They are pneumatically controlled and operated
d. They are pneumatically controlled and electrically operated

Back 25

b. They are electrically controlled and pneumatically operated

Front 26

25. Excessive engine bleed air pressure or temperature will cause what condition to occur?
a. A bleed trip
b. A bleed overheat
c. A bleed overstress

Back 26

a. A bleed trip

Front 27

26. If the APU bleed valve and switch are open, the valve will automatically close with APU shutdown.
a. True
b. False

Back 27

a. True

Front 28

27. A right WING-BODY OVERHEAT light could indicate a bleed air leak in all of the following, except:
a. In the right air condition pack bay
b. In the right leading edge area
c. In the keel beam area
d. In the right engine pylon

Back 28

c. In the keel beam area

Front 29

28. What B-737-500 minimum duct pressure is required to operate two air conditioning packs from one bleed source?
a. 15-20 PSI
b. 20-25 PSI
c. 25-30 PSI
d. 30-45 PSI

Back 29

b. 20-25 PSI

Front 30

29. The potable water system pressurization line connects to which part of the pneumatic manifold?
a. The left side
b. The right side
c. Both sides
d. The water system does not connect to the pneumatic manifold

Back 30

a. The left side

Front 31

30. The Engine Bleed Valve Trip pressure sensor is located ________.
a. Before bleed air reaches the engine bleed valve
b. After the engine bleed air passes the engine bleed valve

Back 31

a. Before bleed air reaches the engine bleed valve

Front 32

31. The Engine Bleed Valve Trip temperature sensor is located
a. Before bleed air reaches the engine bleed valve
b. After the engine bleed air passes the engine bleed valve and pre-cooler

Back 32

b. After the engine bleed air passes the engine bleed valve and pre-cooler

Front 33

32. What limitation is imposed when the DUAL BLEED light is illuminated?
a. The APU must be shut down.
b. No more than idle engine power is allowed
c. The engine on the side that caused the DUAL BLEED light to illuminate must be shut down.
d. The crew must close both engine bleed valves.

Back 33

b. No more than idle engine power is allowed

Front 34

33. External pneumatic air can be used to start the number 1 engine _______.
a. Only if the number 1 engine bleed valve is open
b. Only if the number 1 engine bleed valve is closed
c. Only if the APU bleed valve is open
d. If the isolation valve is open

Back 34

d. If the isolation valve is open

Front 35

34. The APU provides bleed air directly to
a. The left side of the pneumatic manifold
b. The right side of the pneumatic manifold

Back 35

a. The left side of the pneumatic manifold

Front 36

35. The engine bleed valve must be open for ENGINE anti-ice to be available.
a. True
b. False

Back 36

b. False

Front 37

36. What is the normal source of conditioned air for the flight deck with both packs operating? (300/500)
a. The left pack prior to the mix manifold
b. From the left side wall riser
c. From the mix manifold and from either pack

Back 37

a. The left pack prior to the mix manifold

Front 38

37. What is the indication on the respective AIR MIX VALVE position indicator when a pack valve closes? (300/500/700)
a. Full COLD
b. Mid position
c. Full HOT

Back 38

a. Full COLD

Front 39

38. Which correct for pack operation?
a. Bleed air flows through two separate heat exchangers, then through the ACM compressor & turbine
b. Bleed air flows through a heat exchanger, the ACM compressor, a second heat exchanger, then the ACM turbine
c. Bleed air flows through the ACM (Air Cycle Machine) compressor & turbine, then through two parallel heat exchanges.

Back 39

b. Bleed air flows through a heat exchanger, the ACM compressor, a second heat exchanger, then the ACM turbine

Front 40

39. What does an illuminated PACK TRIP OFF light indicate? (8-737-300)
a. Pack valve closed by ACM failure and mix valves remain full HOT
b. Pack valve closed by compressor discharge or turbine inlet overtemp or duct over temp
c. Pack valve closed by duct overheat or pack switch selected off

Back 40

b. Pack valve closed by compressor discharge or turbine inlet overtemp or duct over temp

Front 41

40. When are the RAM DOOR FULL OPEN lights extinguished?
a. With high pack temperature
b. In cruise with low pack temperature
c. On the ground
d. When flaps are extended

Back 41

b. In cruise with low pack temperature

Front 42

41. On the ground, what is the proper indication of the ram door position lights?
a. RAM DOOR FULL OPEN lights illuminated
b. RAM DOOR FULL OPEN lights extinguished
c. RAM DOOR FULL CLOSED lights illuminated

Back 42

a. RAM DOOR FULL OPEN lights illuminated

Front 43

42. What is the function of the turbofan in the ram air exit duct? (8-737-500)
a. Augments ram airflow any time an Air Cycle Machine is operating
b. Augments ram airflow in flight with pack shut down
c. Augments ram airflow when a pack is operating on the ground or inflight with the flaps not up

Back 43

c. Augments ram airflow when a pack is operating on the ground or inflight with the flaps not up

Front 44

43. Which statement is correct regarding the air conditioning system deflector doors?
a. The doors extend on the ground to prevent FOD ingestion
b. The doors retract on the ground to augment ACM cooling
c. The doors extend on the ground to augment ACM cooling

Back 44

a. The doors extend on the ground to prevent FOD ingestion

Front 45

44. What is the purpose of the recirculation fan?
a. Increase pack cooling
b. Reduced pack loads & engine bleed demand
c. Increase pack cooling & engine bleed demand

Back 45

b. Reduced pack loads & engine bleed demand

Front 46

45. Where is filtered RECIRC FAN air discharged?
a. Into the mix manifold
b. Overboard through the flow control valve
c. Into the forward cargo compartment

Back 46

a. Into the mix manifold

Front 47

46. What occurs when a pack switch is placed to the HIGH position with other pack switch in AUTO and the RECIRC FAN switch in AUTO? (737-300)
a. Respective pack & recirc fan go to high flow mode
b. Respective pack goes to high flow & recirc fan shuts down
c. Respective pack goes to high flow & recirc fan starts

Back 47

b. Respective pack goes to high flow & recirc fan shuts down

Front 48

47. Which statement is correct regarding single pack operation with one pack switch in AUTO and one pack switch OFF inflight?
a. Remaining pack goes to high flow in flight when flaps are up
b. Remaining pack goes to high flow with flaps up or down
c. Remaining pack automatically switches to the Standby pressurization controller

Back 48

a. Remaining pack goes to high flow in flight when flaps are up

Front 49

48. With RECIRC FAN switch at AUTO, and both pack switches at AUTO, which statement is correct regarding the recirculation fan operation? (737-500)
a. Recirc fan starts when wither pack switch is placed to HIGH
b. Recirc fan continues to operate when either pack switch is placed to HIGH
c. Recirc fan shuts down when either pack switch is placed to HIGH

Back 49

c. Recirc fan shuts down when either pack switch is placed to HIGH

Front 50

49. What does an illuminated DUCT OVERHEAT light indicate? (737-500)
a. Duct has overheated and mix valves have driven full HOT
b. Duct has overheated and mix valve have driven full COLD
c. Duct has ruptured and mix valves has driven full COLD

Back 50

b. Duct has overheated and mix valve have driven full COLD

Front 51

50. How is hot air removed from the circuit breaker panels and the E & E compartment equipment?
a. By either the main or alternate equipment cooling fans
b. Dumped overboard through the flow control valve which is always open when the recirc fan is operating
c. By opening of the forward outflow valve which is always open when the recirc fan is operating

Back 51

a. By either the main or alternate equipment cooling fans

Front 52

51. Which statements is correct regarding operation of the flow control valve? (737-500)
a. Opens when cabin pressure differential reaches .25 psid
b. Closes when cabin pressure differential reaches 2.5 psid
c. Opens when indicated air speed reaches 250 knots

Back 52

b. Closes when cabin pressure differential reaches 2.5 psid

Front 53

52. What does an illuminated EQUIP COOLING OFF light indicate?
a. NO airflow from the respective equipment cooling fan
b. Flow control valve closure has caused an overheat
c. Recirc fan shutdown has caused an overheat condition

Back 53

a. NO airflow from the respective equipment cooling fan

Front 54

53. How is the forward cargo compartment heated when cabin differential pressure is above 2.6 psi with the forward outflow valve closed? (737-500)
a. The equipment cooling fan maintains airflow around the inside of compartment
b. The recirc fan maintains airflow around the outside of the compartment
c. The recirc fan maintains airflow through the inside of the compartment

Back 54

b. The recirc fan maintains airflow around the outside of the compartment

Front 55

54. Which systems are reset by means of the TRIP RESET switch? (737-500)
a. DUCT OVERHEAT, PACK TRIP OFF, WING-BODY OVERHEAT 1
b. DUCT OVERHEAT, PACK TRIP OFF & BLEED TRIP OFF
c. DUAL BLEED, DUCT OVERHEAT, & PACK TRIP OFF

Back 55

b. DUCT OVERHEAT, PACK TRIP OFF & BLEED TRIP OFF

Front 56

55. How are the pack & isolation valve switches positioned for a BLEEDS-OFF takeoff?
a. Pack switches HIGH, isolation valve switch CLOSE
b. Pack switches OFF, isolation valve switch AUTO
c. Pack switches AUTO, isolation valve switch CLOSE

Back 56

c. Pack switches AUTO, isolation valve switch CLOSE

Front 57

56. During a bleed ON takeoff, the air conditioning pack switches and the isolation valve switch are positioned:
a. The right pack in AUTO the isolation valve switch in AUTO, and the left pack in AUTO
b. HIGH for both packs, with the isolation valves in AUTO
c. AUTO for the left pack, HIGH for the right pack, off for the isolation valve
d. OFF selected for the left pack switch with the isolation valve switched to AUTO, and the right pack switch placed to the high position

Back 57

a. The right pack in AUTO the isolation valve switch in AUTO, and the left pack in AUTO

Front 58

57. Inflight, when both air conditioning packs are operating and the RECIRC FAN is in AUTO, placing a pack switch to HIGH: (737-500)
a. Turns the RECIRC FAN off
b. Causes the pack to operate at a higher than normal rate of air flow
c. Causes the forward outflow valve to open
d. All answers are correct

Back 58

d. All answers are correct

Front 59

58. With both packs operating, if air conditioning smoke appears in the cockpit and in the cabin, the most likely source is: (737-500)
a. Left air conditioning pack
b. Right air conditioning pack

Back 59

a. Left air conditioning pack

Front 60

59. With RECIRC fan switch in AUTO, the fan _________. (737-500)
a. Operates all the time regardless of pack switch position
b. Operates if one pack is turned OFF and the other is in AUTO
c. Operates if one pack is in AUTO and the other is in HIGH

Back 60

b. Operates if one pack is turned OFF and the other is in AUTO

Front 61

60. E & E compartment cooling airflow is normally provided by the:
a. Main flow outflow valve
b. Differential pressure induced air flow
c. Equipment cooling fan
d. Recirculating fan

Back 61

c. Equipment cooling fan

Front 62

61. Overheat temperature sensors that will cause a pack trip are located in the: (737-500)
a. ACM compressor discharge duct, turbine inlet duct, and supply duct
b. ACM compressor discharge duct, supply duct, and passenger cabin overhead at row 5
c. ACM compressor discharge duct, turbine inlet duct, and heat exchanger cooling ram air duct

Back 62

a. ACM compressor discharge duct, turbine inlet duct, and supply duct

Front 63

62. When parked at the gate, external conditioned air temperature controlled by the packs.
a. IS not
b. Should be
c. Is
d. Can be

Back 63

a. IS not

Front 64

63. Bleed air for the pack is as it passes through the primary heat exchanger.
a. Mixed
b. Compressed
c. Cooled
d. Heated

Back 64

c. Cooled

Front 65

64. Each pack has a temperature selector. The selector on the left controls the temperature for. (737-300/500)
a. Flight deck
b. Passenger cabin
c. Jetway
d. Cargo hold

Back 65

a. Flight deck

Front 66

65. With the pack switch turned OFF, the pack valve closes and the mix valves. (737-300/500)
a. Do not move
b. Move to full hot
c. Move to full cold

Back 66

c. Move to full cold

Front 67

66. With aircraft airborne, when is the forward outflow valve closed? (737-300/500)
a. When the aft outflow valve is half open
b. When the aft outflow valve is fully open
c. When the recirculation fan is operating

Back 67

c. When the recirculation fan is operating

Front 68

67. Which cabin pressure control modes utilize the outflow valve DC motor? (non-digital controller)
a. STBY & MAN
b. AUTO & MAN
c. AUTO & STBY

Back 68

a. STBY & MAN

Front 69

68. When should the equipment cooling flow control valve close? (737-300/500)
a. At 2.50 psid
b. At 7.45 psid
c. At 8.65 psid

Back 69

a. At 2.50 psid

Front 70

69. Which model 737 has a TRIM AIR switch on the overhead panel
a. 300 model
b. 500 model
c. 700 model
d. 800 model

Back 70

d. 800 model

Front 71

70. Which of the following 737 models has a Forward Outflow Valve?
a. 500 model
b. 700 model
c. 800 model
d. 900 model

Back 71

a. 500 model

Front 72

71. What occurs when the FLT GRD switch is placed to FLT with aircraft o the ground, packs ON, doors CLOSED, and engine bleed air available? (737-300/500)
a. The main outflow valve opens to depressurize the aircraft when on the ground
b. The main outflow valve modulates as necessary to maintain the aircraft at 200 feet below departure field elevation
c. The main outflow valve closes to pressurize the aircraft to 200 feet below destination field elevation

Back 72

b. The main outflow valve modulates as necessary to maintain the aircraft at 200 feet below departure field elevation

Front 73

72. If the aircraft climbs above the altitude set in the pressurization controller FLT ALT window, the cabin pressure will remain constant until which psid? (737-300/500)
a. 7.45 psid
b. 7.80 psid
c. 7.90 psid

Back 73

c. 7.90 psid

Front 74

73. The B-737-700 has pressure relief valves that limit the cabin differential pressure to what value?
a. 9.1 psid differential
b. 8.5 psid differential
c. 8.0 psid differential
d. 7.48 psid differential

Back 74

a. 9.1 psid differential

Front 75

74. What altitude is set in the STANDBY CAB ALT indicator when operating in AUTO during the receiving aircraft check?
a. Proposed cruise altitude + 1000 feet
b. 200 feet below landing field elevation
c. 300 feet below landing field elevation

Back 75

b. 200 feet below landing field elevation

Front 76

75. What altitude is set in the STANDBY CAB ALT indicator during the receiving aircraft check when operating the flight with the STANDBY pressurization system? (Auto system inop)
a. Takeoff field elevation minus 200 feet
b. Landing field elevation minus 200 feet
c. Landing field elevation minus 300 feet

Back 76

b. Landing field elevation minus 200 feet

Front 77

76. What procedure is preferred for MANUAL control of pressurization? (737-300/500)
a. Use the MANUAL – CLOSE / OPEN switch & MAN AC for slower operations of the outflow valve
b. Use the MANUAL – CLOSE / OPEN switch & MAN DC for faster operation of the outflow valve
c. Use the MANUAL – CLOSE / OPEN switch & MAN DC for slower operation of the outflow valve

Back 77

c. Use the MANUAL – CLOSE / OPEN switch & MAN DC for slower operation of the outflow valve

Front 78

77. What does an illuminated OFF SCHED DESCENT light indicate?
a. Aircraft descending without having reached the selected cruise altitude
b. Power loss to the pressurization system
c. Automatic pressure controller failure

Back 78

a. Aircraft descending without having reached the selected cruise altitude

Front 79

78. What does an illuminated AUTO FAIL light and STANDBY light on the pressurization panel indicate? (737-300/500)
a. Auto control has failed and automatically switched to MANUAL mode
b. Auto control has failed and automatically switched to STANDBY mode
c. Auto control has failed, crew must switch to STANDBY mode

Back 79

b. Auto control has failed and automatically switched to STANDBY mode

Front 80

79. Which condition illuminates the pressurization AUTO FAIL light? (737-300/500)
a. Selected cruise altitude not reached, aircraft descending
b. Cabin rate of change has exceeded + or – 1800 fpm
c. FLT GRD switch was left in the GRD position for takeoff

Back 80

b. Cabin rate of change has exceeded + or – 1800 fpm

Front 81

80. Which lights should come on when AC electrical power is lost to the AUTO pressure control system? (non-digital system) (737-300/500)
a. AUTO FAIL & MANUAL
b. AUTO FAIL & STANDBY
c. AUTO FAIL & OFF SCHED DESCENT

Back 81

b. AUTO FAIL & STANDBY

Front 82

81. Which statement is correct regarding the outflow valve position indicator?
a. Operates only during STANDBY & MANUAL operation
b. Operates only during MANUAL operation
c. Operates in all pressurization modes with AC power available

Back 82

c. Operates in all pressurization modes with AC power available

Front 83

82. What is the purpose of the pressurization flight/ground switch GND position? (737-300/500)
a. Drives main outflow valve full closed on the ground
b. Drives main outflow valve full open on the ground
c. Modulates the main outflow valve during ground operation

Back 83

b. Drives main outflow valve full open on the ground

Front 84

83. What occurs if the FLT I GRD switch is not selected to FLT for takeoff? (737-300/500)
a. The AUTO FAIL & STANDBY lights come on
b. The aircraft will pressurize after takeoff
c. Aircraft does not pressurize until FLT is selected

Back 84

b. The aircraft will pressurize after takeoff

Front 85

84. All of the following items control the ram air system ram door and exhaust louvers except:
a. The compressor discharge duct temperature sensor
b. The flaps
c. The air-ground safety sensor
d. The pressurization controller

Back 85

d. The pressurization controller

Front 86

85. What is the maximum differential pressure allowed by the System Safety Pressure Relief Valves? (737-300/500)
a. A differential pressure of 7.45
b. A differential pressure of 7.90
c. A differential pressure of 8.25
d. A differential pressure of 8.65

Back 86

d. A differential pressure of 8.65

Front 87

86. If the aircraft pressurization system is operating in AUTO on the ground, moving the FLT/GRD switch from GRD to FLT will cause the aircraft to: (737-300/500)
a. Remain depressurized
b. Pressurize to approximately 200 ft. below field elevation
c. Pressurize to the selected cabin altitude

Back 87

b. Pressurize to approximately 200 ft. below field elevation

Front 88

87. The forward outflow valve is closed when: (737-300/500)
a. The main outflow valve is open
b. The RECIRC FAN is operating
c. More than 2.5 psi differential pressure exists
d. The flight/ground switch is in FLT

Back 88

b. The RECIRC FAN is operating

Front 89

88. When is the RAM DOOR FULL OPEN light illuminated?
a. On the ground only
b. On the ground, or in flight with the flaps extended
c. Only in flight
d. Only in flight with the flaps extended

Back 89

b. On the ground, or in flight with the flaps extended

Front 90

89. Illumination of the amber pressurization OFF SCHED DESCENT light indicates what situation?
a. The airplane is descending prior to reaching the selected flight altitude
b. The pressurization controller has failed and switches automatically to
c. The pressurization controller is unable maintain pressurization
d. All answers are correct

Back 90

a. The airplane is descending prior to reaching the selected flight altitude

Front 91

90. What is the maximum allowable differential pressure for takeoff?
a. 200 feet below airport elevation
b. 300 feet below airport elevation
c. .125 PSID
d. 1.0 PSID

Back 91

c. .125 PSID

Front 92

91. The air conditioning packs may be operated in HIGH during a bleed on takeoff.
a. True
b. False

Back 92

b. False

Front 93

92. With the aircraft the maximum certified altitude and one pack operating, what is the lowest cabin altitude can that be maintained?
a. 8000 feet
b. 9000 feet
c. 10,000 feet
d. 13,875 feet

Back 93

a. 8000 feet

Front 94

93. Which of the following rely on pneumatics for operations?
a. Water tank pressurization
b. Waste Water pressurization
c. Coffee Potpressurization
d. FO's Ass pressurization

Back 94

a. Water tank pressurization

Front 95

94. Which of the following 737 models has a forward outflow valve?
a. B737-500
b. B737-Space Shuttle Edition
c. B737-NG
d. B737-599

Back 95

a. B737-500

Front 96

95. Which B737 model has a trim air switch on the overhead panel?
a. B737-Space Shuttle Edition
b. B737-800
c. B737-NG
d. B737-599

Back 96

b B737-800