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737 > Air Systems > Flashcards

Air Systems Flashcards

1
Q

Where does APU bleed air enter the pneumatic manifold

A

Left of the isolation valve

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2
Q

Where does external pneumatic air enter the pneumatic manifold

A

Right of the isolation valve

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3
Q

What are all the sources that provide air for the pneumatic system

A

External air, APU, and 5th and 9th stage engine bleeds

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4
Q

An 800 aircraft has three air conditioning zoned. The temperature controllers are in NORMAL and trim air is ON. The two packs will supply at what temp

A

A temp for the zone requiring the most cooling

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5
Q

What happens when an engine bleed switch is placed to ON

A

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

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6
Q

What does an illuminated engine BLEED TRIP OFF light indicate

A

Excessive engine bleed air pressure or temperature condition, engine bleed valve closes automatically

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7
Q

How is engine bleed air temperature regulated

A

Controlled engine fan air circulates through a precooler

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8
Q

Air for starting the engines is supplied from

A

The left or right pneumatic manifold

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9
Q

Which statements are correct regarding the pneumatic manifold pressure sensors

A

AC powered; located in left&right pneumatic manifolds

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10
Q

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

APU bleed pressure shows on both pointers

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11
Q

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%

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12
Q

What is the power source for the pneumatic isolation valve

A

AC power

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13
Q

Which statement best described the isolation valve function

A

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

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14
Q

What action causes the pneumatic isolation valve to open when the switch is in the AUTO position

A

Placing an engine bleed air switch or pack switch to OFF

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15
Q

What is the function of the DUAL BLEED light

A

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

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16
Q

Which valve and switch combination causes the DUAL BLEED light to come on

A

APU bleed valve OPEN & right engine bleed switch ON, with the isolation valve OPEN

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17
Q

What is the crew action for an illuminated DUAL BLEED light prior to engine start

A

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

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18
Q

Which condition illuminates a WING-BODY OVERHEAT light

A

All answers are correct

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19
Q

What engine stages provide bleed air

A

The 5th and 9th stage

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20
Q

The 9th stage engine bleed air is the primary source of bleed air for pneumatics when the engine is at cruise thrust

A

False

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21
Q

The engine bleed valves are located

A

Downstream of the 9th stage modulation/ shutoff valve

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22
Q

How are the bleed valves operated

A

They are electrically controlled and pneumatically operated

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23
Q

Excessive engine bleed air pressure or temperature will cause what condition to occur

A

A bleed trip

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24
Q

If the APU bleed valve and switch are open, the valve will automatically close with APU shutdown

A

True

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25
Q

A right WING-BODY OVERHEAT light could indicate a bleed leak in all of the following except

A

In the keel beam area

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26
Q

The potable water system pressurization line connects to which part of the pneumatic manifold

A

The left side

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27
Q

The Engine Bleed Valve Trip pressure sensor is located

A

Before bleed air reaches the engine bleed valve

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28
Q

The Engine Bleed Valve Trip temperature sensor is located

A

After the engine bleed air passes the engine bleed air passes the engine bleed valve and precooler

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29
Q

What limitation is imposed when the DUAL BLEED light is illuminated

A

No more than idle engine power is allowed

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30
Q

External pneumatic air can be used to start the number 1 engine

A

If the isolation valve is open

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31
Q

The APU provides bleed air directly to

A

The left side of the pneumatic manifold

32
Q

The engine bleed valve must be open for ENGINE anti-ice to be available

A

False

33
Q

What is the normal source of conditioned air for the flight deck with both packs operating(500)

A

The left pack prior to the mix manifold

34
Q

What is the indication on the respective AIR MIX VALVE position indicator when a pack valve closes(500)

A

Full COLD

35
Q

Which is correct for pack operation

A

Bleed sir flows through a heat exchanger, the ACM compressor, a second heat exchanger, then the ACM turbine

36
Q

What does an illuminated PACK TRIP OFF light indicate(500)

A

Pack valve closed by compressor discharge or turbine inlet overtemp or duct overtemp

37
Q

When are the RAM DoOR FULL OPEN lights extinguished

A

In cruise with low pack temperature

38
Q

On the ground , what is the proper indication of the ram door position lights

A

RAM DOOR FULL OPEN lights illuminated

39
Q

What is the function of the turbofan in the ram air exit duct(500)

A

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

40
Q

Which statement is correct regarding the air conditioning system deflector doors

A

The doors extend on the ground to prevent FOD ingestion

41
Q

What is the purpose of the recirculation fan

A

Reduced pack air loads & engine bleed demand

42
Q

Where is filtered RECIRC FAN air discharged

A

Into the mix manifold

43
Q

What occurs when a pack switch is placed to the HIGH position with the other pack switch in AUTO and the RECIRC FAN switch in AUTO(500)

A

Respective pack goes to high flow & recirc fan shuts down

44
Q

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

45
Q

With the RECIRC FAN switch at AUTO , and both pack switches at AUTO, which statement is correct regarding the recirculation fan operation(500)

A

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

46
Q

What does an illuminated DUCT OVERHEAT light indicate(500)

A

Duct has overheated and mix valves have driven full COLD

47
Q

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

48
Q

Which statement is correct regarding operation of the flow control valve(500)

A

Closes when cabin pressure differential reaches 2.5 psid

49
Q

What does an illuminated EQUIP COOLING OFF light indicate

A

No airflow from the respective equipment cooling fan

50
Q

How is the forward cargo compartment heated when cabin differential pressure is above 2.5 psi with the forward outflow valve closed(500)

A

The recirc fan maintains airflow around the outside of the compartment

51
Q

Which systems are reset by means of the TRIP RESET switch(500)

A

DUCT OVERHEAT, PACK TRIP OFF & BLEED TRIP OFF

52
Q

How are the pack & isolation valve switches positioned for a BLEEDS-OFF takeoff

A

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

53
Q

E&E compartment cooling air flow is normally provided by the

A

Equipment cooling fan

54
Q

With the recirc fan switch in AUTO, the fan(500)

A

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

55
Q

Inflight, when both air conditioning packs are operating and the Recirc Fan is in Auto, placing a pack switch to High(500)

A

All answers are correct

56
Q

With both packs operating , if air conditioning smoke appears in the cockpit and in the cabin, the most likely source is(500)

A

Left air conditioning pack

57
Q

Overheat temperature sensors that will cause a pack trip are located in the(500)

A

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

58
Q

When parked at the gate, external conditioned air temperature_______controlled by the packs

A

Is not

59
Q

Bleed air for the pack is_____as it passes through the primary heat exchanger

A

Cooled

60
Q

Each pack has a temperature selector. The selector on the left controls the temperature for(500)

A

Flight deck

61
Q

With the pack switch turned OFF, the pack valve closes and the mix valves______(500)

A

Move to full cold

62
Q

With the aircraft airborne, when is the forward outflow valve closed(500)

A

When the recirculating fan is operating

63
Q

Which model 737 has a TRIM AIR switch on the overhead panel

A

800 model

64
Q

Which of the following models has a Forward Outflow Valve

A

500

65
Q

What occurs when the FLT GND switch is placed to FLT with the aircraft on the ground, packs ON, doors CLOSED, and engine bleed air avail(500)

A

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

66
Q

What altitude is set in the STANDBY CAB ALT indicator when operating in AUTO during the receiving aircraft check

A

200 ft below landing field elev

67
Q

What altitude is set in the STANDBY CAB ALT indicator during the receiving aircraft check when operating the flight with the SAtANDBY pressurization system(auto system inop)

A

Takeoff field elev minus 200ft

68
Q

What does an illuminated OFF SCHED DESCENT light indicate

A

Aircraft descending without having reached the selected cruise altitude

69
Q

Which statement is correct regarding the outflow valve position indicator

A

Operates in all pressurization modes with AC power available

70
Q

All of the following items control the ram air system ram door and exhaust louvers except

A

The pressurization controller

71
Q

When is the RAM DOOR FULL OPEN light illuminated

A

On the ground, or in flight with the flaps extended

72
Q

Illumination of the amber pressurization OFF SCHED DESCENT light indicates what situation

A

The airplane is descending prior to reaching the selected flight altitude

73
Q

What is the maximum allowable differential pressure for takeoff

A

.125 psid

74
Q

The air conditioning packs may be operated in HIGH during a bleeds on takeoff

A

False

75
Q

With the aircraft at the maximum certified altitude and one pack operating, what is the lowest cabin altitude that can be maintained

A

8000 ft

737 (17 decks)

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