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UAL 737NG Systems (pitu) > Air Systems > Flashcards

Air Systems Flashcards

1
Q

What are the required immediate action items for a cabin altitude warning horn inflight?

A
  1. Oxygen Mask & Regulators….. ON & 100%
  2. Crew Communications ………. Establish
  3. Seatbelt Sign ………………….. ON
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2
Q

Bleed air is obtained from the ____ & _____ stages of the compressor section of the engine.

A

5th; 9th

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3
Q

When 5th low-stage pressure is insufficient, the ___ high-stage valve modulates open to maintain proper pressure.

A

9th

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4
Q

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

A

pneumatically

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5
Q

The illumination of the BLEED TRIP OFF light indicates ________.

A

engine bleed air temperature or pressure exceeds a predetermined limit

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6
Q

What occurs when the BLEED TRIP OFF light illuminates?

A

The respective engine bleed air valve closes automatically

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7
Q

What precools engine bleed air?

A

A precooler, or heat exchanger

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8
Q

What sources of air can be used to start the engine?

A

APU, ground air cart, and engine bleed air

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9
Q

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

A

closed

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10
Q

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

A

Open

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11
Q

Does the APU bleed air switch affect the isolation valve position?

A

No

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12
Q

Does the APU bleed air valve, on the B737-800, automatically close when the APU is shut down?

A

Yes

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13
Q

The APU bleed air valve is___ activated and ______ operated.

A

DC; pneumatically

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14
Q

With the DUAL BLEED light illuminated, engine thrust must be _______.

A

limited to idle

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15
Q

What causes a wing-body overheat condition?

A

a bleed air duct leak

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16
Q

If a leak in the bleed duct from the APU occurs, which WING-BODY OVER HEAT light will illuminate?

A

Left

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17
Q

With the ISOLATION VALVE switch in AUTO, the isolation valve _________ if either engine BLEED air or air condition PACK switch is positioned OFF.

A

automatically opens

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18
Q

The Wing-Body Overheat (OVHT) TEST switch _____________.

A

() all answers are correct
() tests wing-body overheat detector circuit
() illuminates both WING-BODY OVERHEAT lights

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19
Q

Conditioned air for the cabin comes from _________________.

A

either the aircraft air conditioning system or a preconditioned ground source

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20
Q

Conditioned air from the ______, upstream of the mix manifold, flows directly to the flight deck.

A

Left pack

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21
Q

Air from the left pack, air from the right pack, and air from the recirculation system is combined in the ________.

A

Mix manifold

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22
Q

The APU can supply air for ________ on the ground for all operations

A

Two packs

23
Q

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

A

the packs provides “normal air flow”

24
Q

With the air conditioning PACK switches in AUTO and one pack is operating _________.

A

The operating pack provides high air flow

25
Q

With the air conditioning PACK switch in HIGH, _________.

A

the respective pack provides high air flow

26
Q

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

A

full cold

27
Q

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

A

air mix valves

28
Q

On the B737-700, the automatic temperature controller is bypassed when the temperature selector is positioned to ________.

A

Manual

29
Q

The ram air system is used to provide cooling for the __________ in the air conditioning systems.

A

Heat exchangers

30
Q

The RAM DOOR FULL OPEN light illuminates whenever the ram door is ___________.

A

fully open

31
Q

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

A

full cold

32
Q

On the B737-700, when a PACK TRIP OFF light illuminates, the pack valve ________.

A

automatically closes and the mix valv drives full cold

33
Q

M AIR133 – (6.20.30.9)

In a B737-700, a PACK TRIP OFF is caused by _________.

A

pack temperatures exceeding limits

34
Q

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

A

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

35
Q

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

A

reduces

36
Q

What makes the equipment cooling OFF light illuminate?

A

loss of air flow due to failure of an equipment cooling fan

37
Q

The TRIP RESET switch resets the ______________.

A

all answers are correct

  • bleed trip off, pack trip off
  • duct overheat on b737-700 or the ZONE TEMP on the b737-800
38
Q

On the B737-800, the PACK light indicates _____________.

A

a pack trip pff or failure of both primary and standby pack controls

39
Q

The aircraft is pressurized by bleed air supplied to and distributed by _________.

A

the air conditioning system

40
Q

What is cabin air outflow controlled by?

A

the outflow valve and the overboard exhaust valve

41
Q

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

A

three

42
Q

On the cabin altitude panel, which scale on the CABIN Altimeter (ATL) / Differential Pressure (DIFF PRESS) Indicator indicates the cabin altitude in feet?

A

inner scale

43
Q

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

A

outer scale

44
Q

How can the intermittent cabin altitude warning horn be cut out?

A

by pushing the ALTITUDE HORN CUTOUT switch

45
Q

At what cabin altitude will the intermittent cabin altitude warning sound?

A

10.000ft

46
Q

How is the cabin rate of climb displayed?

A

on the cabin rate of climb indicator

47
Q

On the Cabin Pressurization Panel, which modes automatically pressurize the aircraft?

A

AUTO & ALTN

48
Q

On the Cabin Pressurization Panel, the MAN mode controls aircraft pressurization _____________.

A

manually by the outflow valve switch

49
Q

On the Cabin Pressurization Panel, with the pressurization mode selector in the MAN mode, the outflow valve switch takes approximately _______ to move the outflow valve in the full range of motion

A

20 seconds

50
Q

On the Cabin Pressurization Panel, an illuminated amber AUTO FAIL light indicates _____________.

A

automatic pressurization system failure is detected

51
Q

On the Cabin Pressurization Panel, if both the amber AUTO FAIL light and the green ALTN light is illuminated, _________.

A

a single channel controller failure has ocurred

52
Q

The OFF SCHED DESCENT light indicates the aircraft began descent before having reached the planned cruise altitude. The controller programs the cabin ____________.

A

land at the takeoff field elevation withour further pilot inputs

53
Q

On the B737-700, the pack valve will close if the cooling cycle overheats and is associated with a PACK TRIP OFF light.

A

true

UAL 737NG Systems (pitu) (15 decks)

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