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Flashcards in Test Qs Deck (58)
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1

The passenger oxygen system is supplied by ___________located at each Passenger Service Unit (PSU)

individual chemical oxygen generators

2

The passenger oxygen system is activated automatically by a pressure switch at a cabin altitude of ______ or when the Passenger Oxygen Switch on the aft overhead panel is positioned to ON.

14.000 ft

3

An illuminated “PASS OXY ON” light on the aft overhead panel indicates:

The passenger oxygen system has been activated

4

How is the flow of oxygen initiated to the passenger masks?

By pulling any mask in the unit down

5

Once passenger oxygen is activated, oxygen flows for approximately _____ and cannot be shutoff.

12 min

6

B737-800, bleed air is obtained from the ____ & ____ stages of the compressor section of the engine

5th; 9th

7

B737-800, when 5th low-stage pressure is insufficient, the ___ high-stage valve modulates open to maintain proper pressure

9th

8

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

pneumatically

9

The illumination of the BLEED TRIP OFF light indicates ________.

engine bleed air temperature or pressure exceeds a predetermined limit

10

What occurs when the BLEED TRIP OFF light illuminates?

The respective engine bleed air valve closes automatically

11

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

APU, ground air cart, and engine bleed air

12

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 _____.

closed

13

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 _____.

open

14

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

no

15

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

yes

16

The APU bleed air valve is___ activated and ______ operated.

DC; pneumatically

17

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

limited to idle, if not conducting single engine taxi operations on the ground.

18

What causes a wing-body overheat condition?

a bleed air duct leak

19

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

left

20

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

21

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

1) Tests wing-body overheat detector circuits
2) Illuminates both WING-BODY OVERHEAT lights

22

Conditioned air for the cabin comes from _________________.

either the aircraft air conditioning system or a preconditioned ground source

23

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

left pack

24

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

mix manifold

25

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

two packs

26

In flight with the air conditioning PACK switches in AUTO and both packs operating, _________.

the packs provide “normal air flow”

27

Inflight with one PACK operating _________.

the operating pack provides high air flow automatically, if the flaps remain retracted

28

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

heat exchangers

29

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

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

30

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

reduces