Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

United 737 SV study > United 737 Air Systems/Pneumatics/AC/Pressurization > Flashcards

United 737 Air Systems/Pneumatics/AC/Pressurization Flashcards

1
Q

On the cabin pressurization panel, what has occured if both the Amber AUTO FAIL light and the green ALTN light is illuminated?

A

A single channel controller failure has occured

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Which stages of the compressor section is bleed air obtained from?

A

5th and 9th

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

The ___ high stage valve modulates open to maintain proper pressure when 5th low stage pressure is insufficient

A

9th

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

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

A

Pneumatically

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

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

A

Engine bleed air temperature or pressure exceeds a predetermined limit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

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

A

OPEN

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

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

A

FALSE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The APU bleed air valve is ____ operated and ___ activated

A

pneumatically; DC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Engine thrust must be ___ with the DUAL BLEED light illuminated

A

Limited to Idle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

___ causes a WING BODY OVERHEAT condition.

A

A bleed air duct leak

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

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

A

LEFT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The isolation valve____ if either engine BLEED air or air condition PACK switch is positioned OFF with the ISOLATION VALVE switch in AUTO

A

Automatically Opens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

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

A

Left Pack

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

On the ground, the APU can supply air for ___for all operations

A

2 packs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

With the Air Conditioning PACK switches in AUTO and both packs are operating

A

the packs provide “Normal air flow”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

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

A

the operating pack provides HIGH AIR FLOW!

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Anyime the pack valve closes on the 737 700 the air mix valves are driven to the ____ position automatically

A

FULL COLD

22
Q

In the automatic temperature mode on the 737 700 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 737 700.

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 737 700

A

FULL COLD

26
Q

When a PACK TRIP OFF light illuminates, the pack valve ______ on the 737 700.

A

Automatically closes and the mix valve drives full cold

27
Q

In a 737 800 ___ if an amber ZONE TEMP light illuminates.

A

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

28
Q

The recriculation fan system ____ the engine bleed air demand and air conditioning load

A

REDUCES

29
Q

What does the TRIP RESET switch reset?

A
  1. DUCT OVERHEAT on the 737 700 or the ZONE TEMP on the 737 800
  2. BLEED TRIP OFF, PACK TRIP OFF
30
Q

On the 737 800 what is indicated by the PACK light?

A

A pack trip off
or
Failure of both primary and standby pack controllers

31
Q

Cabin air outflow controlled by

A

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 the ___ DC motors

A

THREE

35
Q

On the cabin altitude panel, the ___ on the CABIN altimeter/ Differential Pressure indicator indicates the cabin altitude in feet

A

INNER SCALE

36
Q

On the Cabin altitude panel, the ___ on the CABIN Altimeter/Differential Pressure indicator indicates the differential pressure between cabin and ambient PSI

A

OUTER SCALE

37
Q

The intermittent cabin altitude warning horn can be cut out ___

A

by pushing the ALT HORN CUTOUT Switch

38
Q

At _____ cabin altitude the intermittent cabin altitude warning will sound

A

10,000’

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

41
Q

What precools engine bleed air?

A

A precooler, or heat exchanger

42
Q

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

A

NO

43
Q

Does the APU bleed air valve automatically close when the APU is shut down?

A

YES

44
Q

The Wing Body Overheat Test Switch ____

A

All answers are correct

45
Q

Conditioned air for the cabin comes from ____

A

Air from the Aircraft AC or a preconditioned ground source

46
Q

With the air conditioning PACK switch in HIGH ____

A

The respective pack provides high air flow

47
Q

In a 737 700- a PACK TRIP OFF is caused by

A

A pack temperature exceeding limits

48
Q

What makes the equipment cooling OFF light illuminate?

A

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

49
Q

The Pressurization Mode Selector in the MAN mode, the outflow valve switch takes approx. _____ second to move the outflow valve in the full range of motion.

A

20 seconds

50
Q

T/F 737 700: The pack valve will close if the cooling cycle overheats and is associated with a PACK TRIP OFF light

A

True

United 737 SV study (14 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions