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United B737 (pitu) > Air System > Flashcards

Air System Flashcards

1
Q

Bleed air is obtained from the ____ & _____ stages of the compressor section of the engine.
() 5th; 9th
() 6th; 10th
() 4th; 12th

A

5th and 9th

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2
Q

The engine bleed air valve is normally DC power activated and ______ operated.
() pneumatically
() electrically
() hydraulically

A

pneumatically

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3
Q

What occurs when the BLEED TRIP OFF light illuminates?
() The respective engine bleed air valve must be manually closed
() The respective engine bleed air valve closes automatically
() The APU bleed air valve closes automatically

A

The respective engine bleed air valve closes automatically

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4
Q

What precools engine bleed air?
() The respective PACK
() A hydraulic heat exchanger
() A precooler, or heat exchanger

A

A precooler, or heat exchanger

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5
Q

What sources of air can be used to start the engine?
() APU only
() APU, ground air cart, and engine bleed air
() APU, ground air cart, engine bleed air, and ground air conditioning

A

APU, ground air cart, and engine bleed air

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6
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 _____.
() closed
() open
() in transit

A

open

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7
Q

Does the APU bleed air switch affect the isolation valve position? () Yes
() No

A

no

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8
Q

Does the APU bleed air valve, on the B737-800, automatically close when the APU is shut down?
() Yes
() No

A

yes

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9
Q

The APU bleed air valve is___ activated and ______ operated.
() DC; electrically
() DC; pneumatically
() AC; hydraulically

A

DC; pneumatically

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10
Q

What causes a wing-body overheat condition?
() a fuel pump overheat
() a bleed air duct leak
() a hydraulic leak in the spar

A

a bleed air duct leak

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11
Q

If a leak in the bleed duct from the APU occurs, which WING-BODY OVER HEAT light will illuminate?
() Left
() Right
() Neither

A

left

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12
Q

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

A

automatically opens

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13
Q

The Wing-Body Overheat (OVHT) TEST switch _____________.
() tests wing-body overheat detector circuit
() illuminates both WING-BODY OVERHEAT lights
() all answers are correct

A

all answers are correct

tests wing-body overheat detector circuit

illuminates both WING-BODY OVERHEAT lights

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14
Q

Conditioned air for the cabin comes from _________________.
() either the aircraft air conditioning system or heat exchanger located in the balance bay
() either the aircraft air conditioning system or a preconditioned ground source
() ram air

A

either the aircraft air conditioning system or a preconditioned ground source

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15
Q

Conditioned air from the ______, upstream of the mix manifold, flows directly to the flight deck.
() left pack
() right pack
() APU pack

A

left pack

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16
Q

Air from the left pack, air from the right pack, and air from the recirculation system is combined in the ________.
() mix manifold
() aircraft cabin
() the lavatory

A

mix manifold

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17
Q

With the air conditioning PACK switches in AUTO and both packs are operating _________.
() the packs provide “normal air flow”
() the packs provide “high air flow”
() the left pack provides “normal air flow” and the right pack provides “high air flow”

A

the packs provide “normal air flow

18
Q

With the air conditioning PACK switches in AUTO and one pack is operating _________.
() the operating pack provides high air flow
() the operating pack provides low air flow
() the operating pack shuts down above FL250

A

the operating pack provides high air flow

19
Q

On the B737 -700, Anytime the pack valve closes, the air mix valves are driven to the _______ position automatically.
() full hot
() full cold
() 20C

A

Full cold

20
Q

On the B737 -700, In the automatic temperature mode, the ________ are operated by the automatic temperature controller.
() forward outflow valve
() rear outflow valve
() air mix valves

A

Air Mix Valves

21
Q

The ram air system is used to provide cooling for the __________ in the air conditioning systems.
() heat exchangers
() hydraulic pumps
() APU

A

heat exchangers

22
Q

The RAM DOOR FULL OPEN light illuminates whenever the ram door is ___________.
() fully open
() fully closed
() partially open

A

Fully Open

23
Q

On a B737-700, a DUCT OVERHEAT light causes the appropriate air mix valve to drive ___________.
() full hot
() full cold
() to 20C

A

Full cold

24
Q

On the B737-700, when a PACK TRIP OFF light illuminates, the pack valve ________.
() automatically opens and the mix valve drives full cold
() automatically closes and the mix valve drives full cold
() must be manually opened

A

automatically closes and the mix valve drives full cold

25
Q

In a B737-700, a PACK TRIP OFF is caused by _________.
() pack temperatures exceeding limits
() duct pressure exceeding limits
() low pack pressure

A

pack temperatures exceeding limits

26
Q

In a B737-800, what happens if an amber ZONE TEMP light illuminates?
() the MASTER CAUTION light will illuminate, and the pack valve will go full cold
() the MASTER CAUTION light will illuminate, and both packs will trip off
() the MASTER CAUTION light will illuminate, and the trim air valve closes

A

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

27
Q

The recirculation fan system __________ the air conditioning load and the engine bleed air demand.
() reduces
() increases
() has not effect on

A

Reduces

28
Q

What makes the equipment cooling OFF light illuminate?
() placing the equipment cooling fan in alternate
() loss of air flow due to failure of an equipment cooling fan
() loss of the left pack in flight

A

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

29
Q

On the B737-800, the PACK light indicates _____________.
() a pack trip off or failure of both primary and standby pack controls
() a pack trip off and the valve has driven to full hot
() all answers are correct

A

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

30
Q

The aircraft is pressurized by bleed air supplied to and distributed by _________.
() the hydraulic system
() the air conditioning system
() all answers are correct

A

the air conditioning system

31
Q

What is cabin air outflow controlled by?
() the outflow valve and the overboard exhaust valve
() the equipment cooling exhaust system
() forward outflow valve

A

the outflow valve and the overboard exhaust valve

32
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?
() Inner Scale
() Outer Scale
() Lower Scale

A

outer

33
Q

How can the intermittent cabin altitude warning horn be cut out?
() By pushing the FIRE WARNING Bell Cutout
() By pushing the Altitude (ATL) HORN CUTOUT Switch
() By pushing the MASTER CAUTION push to rest

A

By pushing the Altitude (ATL) HORN CUTOUT Switch

34
Q

How is the cabin rate of climb displayed?
() by calculating the split between CABIN Altimeter (ATL) / Differential Pressure (DIFF PRESS) Indicator
() by accessing the FMC Cabin Altitude page
() on the cabin rate of climb indicator

A

on the cabin rate of climb indicator

35
Q

On the Cabin Pressurization Panel, which modes automatically pressurize the aircraft?
() AUTO ; MAN
() AUTO ; ALTN
() AUTO, ALTN & MAN

A

AUTO ; ALTN

36
Q

On the Cabin Pressurization Panel, the MAN mode controls aircraft pressurization _____________.
() manually by setting the FLT ALT and LAND ALT with the predetermined chart
() manually by the Outflow Valve switch
() automatically

A

manually by the Outflow Valve switch

37
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.
() 5 seconds
() 20 seconds
() 60 seconds

A

20 seconds

38
Q

On the Cabin Pressurization Panel, an illuminated amber AUTO FAIL light indicates _____________.
() automatic pressurization system failure is detected
() the aircraft is pressurizing to the departure airport
() the landing altitude needs to be reset

A

automatic pressurization system failure is detected

39
Q

The OFF SCHED DESCENT light indicates the aircraft began descent before having reached the planned cruise altitude. The controller programs the cabin ____________.
() to land at the arrival field elevation set in the LAND ALT window without further pilot inputs
() to land at the takeoff field elevation without further pilot inputs
() to slowly depressurize the aircraft to 8,000 feet cabin altitude

A

to land at the takeoff field elevation without further pilot inputs

40
Q

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

A

true

United B737 (pitu) (17 decks)

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