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B737NG-600 > Chapter 1: Air Conditioning/Pressurization > Flashcards

Chapter 1: Air Conditioning/Pressurization Flashcards

1
Q

The ram-air doors are fully open in flight under which conditions?

A

Slow-flight with the flaps not fully retracted.

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2
Q

When are the ram-air doors fully open?

A

On the ground or during slow flight with flaps not fully retracted.

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3
Q

What is the source of barometric pressure used by the pressurization system auto contollers?

A

The ADIRUs.

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4
Q

If the controller is not responding, the AUTO FAIL warning light on the Cabin Pressurization panel will illuminate if the cabin rate of descent or climb exceeds…?

A

± 2000 FPM

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5
Q

The OVHT TEST push button switch on the Bleed Air Panel tests which circuits?

A

The wing body overheat circuits.

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6
Q

The recirculation fan is powered by an AC or a DC motor?

A

AC motor.

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7
Q

How much time is required to drive the pressurization outflow valve through its full range using manual control?

A

20 seconds

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8
Q

Duct overheat detection for the left pack is located…

A

In the duct leading from the left pack to the Flight Deck.

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9
Q

What is the maximum altitude that may be set in the FLT ALT windows on the Cabin Pressurization panel?

A

42,000’

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10
Q

A BLEED TRIP OFF is caused by…

A

…either an over-temperature or an over-pressure condition.

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11
Q

If the automatic temperature controller fails, what happens to the mix valves, and can they be controlled?

A

The mix valves stay at the last setting and can be controlled in manual.

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12
Q

If the pressurization controller is not responding, the AUTO FAIL warning light on the Cabin Pressurization panel will illuminate when the cabin differential pressure exceeds…

A

…8.75 psi.

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13
Q

In normal cruise the air conditioning ram air doors…

A

… modulate between open and closed according to cooling requirements.

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14
Q

Will the APU bleed valve open when the APU bleed switch is positioned to ON?

A

Yes, but only if the APU is operating.

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15
Q

The 9th-stage bleed air valve acts as a temperature and pressure regulator or as a modulation and shut-off valve?

A

A modulation and shut-off valve.

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16
Q

If a pack valve closes, what is the effect on the respective mix valve?

A

The mix valve drives full cold.

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17
Q

What is the primary source of conditioned air for the Flight Deck?

A

The left pack.

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18
Q

The ram air system deflector doors are electrically extended…

A

… when activated by the ground safety sensor.

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19
Q

What is the normal position of the isolation valve when the Isolation Valve switch is in AUTO?

A

Closed

20
Q

Why is throttle position used by the automatic pressurization contollers?

A

To de-pressurize the cabin at lower power settings on the ground.

21
Q

The source of bleed air is provided by…

A

The 5th-stage of the compressor section augmented by the 9th-stage.

22
Q

What is the source of the heated airflow to the mix-manifold coming from the forward cargo compartment?

A

Air routed through the Flight Deck electronics and the E & E compartment.

23
Q

The engine bleed valve is operated by…

A

A DC motor and bleed air pressure.

24
Q

The mix valve position indicators indicate…

A

the actual position of the mix valve in both manual and automatic mode.

25
Q

The 5th-stage bleed air valve acts as a…

A

pressure regulator and shutoff valve.

26
Q

If both the AUTO FAIL and MANUAL warning lights on the Cabin Pressurization panel are illuminated, what is indicated with respect to the automatic controllers?

A

A single controller has failed and pressurization has automatically switched to the operating controller.

27
Q

What is the maximum negative cabin pressure differential?

A

0.125 psi

28
Q

What is indicated if the AUTO FAIL warning light is illuminated on the Cabin Pressure panel with regard to the automatic controllers?

A

Both controllers have failed.

29
Q

When the recirc fan switch is in AUTO the fan will operate…

A

continuously, except with both Packs on and one or both in HIGH.

30
Q

What cabin altitude is the cabin regulated to at FL410?

A

8000’

31
Q

The PACK TRIP OFF warning light indicates which condition?

A

The pack temperature has exceeded limits.

32
Q

What is the maximum altitude that may be set in the LAND ALT windows on the Cabin Pressurization panel?

A

14,000’

33
Q

Using the engine bleed air, when will a pack automatically switch to HIGH?

A

In flight with one pack not operating with flaps up and the pack switches in AUTO.

34
Q

What is the maximum allowable differential pressure?

A

9.10 psi

35
Q

An overheat in the APU bleed air duct will illuminate which warning light on the Bleed Air Panel?

A

The left WING-BODY OVERHEAT warning light.

36
Q

With the Isolation Valve switch in AUTO, what will cause the isolation valve to open?

A

Positioning either engine bleed or either pack switch to OFF.

37
Q

If the controller is not responding, the AUTO FAIL warning light on the Cabin Pressurization panel will illuminate if the cabin altitude exceeds…

A

15,800’

38
Q

The duct overheat will…

A

cause both mix valves to drive full cold and illuminate the DUCT OVERHEAT light.

39
Q

What is indicated by the OFF SCHED DESCENT warning on the Cabin Pressurization panel?

A

The aircraft has descended before reaching the planned cruise altitude as set in the FLT ALT indicator.

40
Q

What will cause illumination of the DUAL BLEED warning?

A

The APU bleed air valve is open, and the number 1 engine bleed switch is ON, or the number 2 engine bleed switch is ON, and the isolation valve is open.

41
Q

How is the bleed air from the engine initially cooled for the cabin temperature control?

A

A heat exchanger in the ram air system.

42
Q

If the aircraft must do an emergency RTB, what is the landing altitude as programmed by the automatic controller?

A

The cabin altitude as sensed by the controller before take-off.

43
Q

The TRIP RESET on the Bleed Air Panel will reset which condition(s)?

A

PACK TRIP OFF and BLEED TRIP OFF.

44
Q

The BLEED TRIP OFF light illuminated indicates what condition(s)?

A

Excessive engine bleed air temperature or pressure.

45
Q

If only one pack is operating, the operating pack will regulate to high flow with the pack switch in AUTO under what conditions?

A

When operating the pack with the APU as the only bleed source or in-flight with the flaps up.

46
Q

Duct overheat detection for the right pack is located…

A

in the duct leading from the mix manifold to the sidewall riser.

B737NG-600 (2 decks)

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