Air Systems/Pneumatics/Air Conditioning/Pressurization Flashcards

1
Q

On the Cabin Pressurization Panel, what has occurred if both the amber AUTO FAIL light and the green ALTN light is illuminated?

A

a single channel controller failure has occurred

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2
Q

The OFF SCHED DESCENT light indicates the aircraft began descent before having reached the planned cruise altitude. What does the controller program the cabin to?

A

to land at the takeoff field elevation without further pilot inputs

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3
Q

Which stages of the compressor section is bleed air is obtained from (NG aircraft)?

A

5th; 9th

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4
Q

The ___ high-stage valve modulates open to maintain proper pressure when 5th low-stage pressure is
insufficient (NG aircraft).

A

9th

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5
Q

The engine bleed air valve is normally _____ operated and DC power activated.

A

pneumatically

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6
Q

What does the illumination of the BLEED TRIP OFF light indicate?

A

engine bleed air temperature or pressure exceeds a predetermined limit

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7
Q

When the BLEED TRIP OFF light illuminates, what effect does this have on the engine bleed air system?

A

The respective engine bleed air valve closes automatically

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8
Q

The isolation valve is _____ when the isolation valve switch in AUTO, both engine bleed air switches ON, and both air conditioning pack switches AUTO or HIGH.

A

closed

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9
Q

The isolation valve is _____ when the isolation valve switch in AUTO, if either an engine bleed air switch or
an air conditioning pack switch is positioned OFF.

A

open

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10
Q

Turning the APU bleed air switch OFF with the PACK switches in AUTO will cause the isolation valve to open.

A

False

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11
Q

The APU bleed air valve is___ operated and ______ activated.

A

pneumatically; DC

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12
Q

Engine thrust must be _______ with the DUAL BLEED light illuminated.

A

limited to idle

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13
Q

______causes a WING-BODY OVERHEAT condition.

A

a bleed air duct leak

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14
Q

Which WING-BODY OVERHEAT light will illuminate if a leak in the bleed duct from the APU occurs?

A

Left

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15
Q

The isolation valve _________ if either engine BLEED air or air condition PACK switch is positioned OFF with
the ISOLOATION VALVE switch in AUTO.

A

automatically opens

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16
Q

Conditioned air from which PACK, upstream of the mix manifold, flows directly to the flight deck?

A

left pack

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17
Q

Air from the left pack, air from the right pack, and air from the recirculation system is combined within the
_______.

A

mix manifold

18
Q

On the ground, the APU can supply air for ________ for all operations.

A

two packs

19
Q

With the air conditioning PACK switches in AUTO and both packs are operating _________.

A

the packs provide “normal air flow”

20
Q

When one pack is operating, _________ with the air conditioning PACK switches in AUTO.

A

the operating pack provides high air flow

21
Q

Anytime the pack valve closes on the B737 -700, the air mix valves are driven to the _______ position
automatically.

A

full cold

22
Q

In the automatic temperature mode on the B737 -700, the ________ are operated by the automatic
temperature controller.

A

air mix valves

23
Q

The automatic temperature controller is bypassed when the temperature selector is positioned to ________
on the B737-700,

A

MANUAL

24
Q

The ram air system is used to provide cooling for what part of the air conditioning systems?

A

heat exchangers

25
Q

A DUCT OVERHEAT light causes the appropriate air mix valve to drive ___________ on a B737-700.

A

full cold

26
Q

When a PACK TRIP OFF light illuminates, the pack valve ________ on the B737-700.

A

• automatically closes and the mix valve drives full cold

27
Q

In a B737-800, _______ if an amber ZONE TEMP light illuminates?

A

the MASTER CAUTION light will illuminate, and the trim air valve closes

28
Q

The recirculation fan system __________ the engine bleed air demand and air conditioning load.

A

reduces

29
Q

What does the TRIP RESET switch reset?

A
  • DUCT OVERHEAT on the B737-700, or the ZONE TEMP on the B737-800
  • BLEED TRIP OFF, PACK TRIP OFF
30
Q

On the B737-800, what is indicated by the PACK light?

A

• a pack trip off or failure of both primary and standby pack controls

31
Q

Cabin air outflow controlled by______.

A

the outflow valve and the overboard exhaust valve

32
Q

On the Cabin Pressurization Panel, what does an illuminated amber AUTO FAIL light indicate?

A

automatic pressurization system failure is detected

33
Q

manually positioning the outflow valve to OPEN will cause cabin altitude to _________.

A

Climb

34
Q

The main outflow valve is the overboard exhaust exit for the majority of the air circulated through the
passenger cabin and is actuated by one of _____ DC motors and

A

three

35
Q

On the cabin altitude panel, the ________on the CABIN Altimeter (ATL) / Differential Pressure (DIFF PRESS)
Indicator indicates the cabin altitude in feet.

A

• inner scale

36
Q

On the cabin altitude panel, the _______ on the CABIN Altimeter (ATL) / Differential Pressure (DIFF PRESS)
Indicator indicates the differential pressure between cabin and ambient in psi.

A

outer scale

37
Q

The intermittent cabin altitude warning horn can be cut out ______.

A

By pushing the Altitude (ATL) HORN CUTOUT Switch

38
Q

At _______ cabin altitude the intermittent cabin altitude warning will sound.

A

10,000 feet

39
Q

Cabin rate of climb displayed ______.

A

on the cabin rate of climb indicator

40
Q

On the Cabin Pressurization Panel, _______modes automatically pressurize the aircraft.

A

AUTO & ALTN