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United B737 (pitu) > Air System > Flashcards

Flashcards in Air System Deck (40)
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1

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

5th and 9th

2

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

pneumatically

3

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

The respective engine bleed air valve closes automatically

4

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

A precooler, or heat exchanger

5

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

APU, ground air cart, and engine bleed air

6

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

open

7

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

no

8

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

yes

9

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

DC; pneumatically

10

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

a bleed air duct leak

11

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

left

12

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

automatically opens

13

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

all answers are correct

tests wing-body overheat detector circuit

illuminates both WING-BODY OVERHEAT lights

14

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

either the aircraft air conditioning system or a preconditioned ground source

15

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

left pack

16

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

mix manifold

17

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”

the operating pack provides high air flow

18

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

the respective pack provides high air flow

19

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

Full cold

20

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

Air Mix Valves

21

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

heat exchangers

22

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

Fully Open

23

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

Full cold

24

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

automatically closes and the mix valve drives full cold

25

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

pack temperatures exceeding limits

26

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

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

27

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

Reduces

28

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

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

29

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

30

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

the air conditioning system