Air Systems/Pneumatics/Air Conditioning/Pressurization

Question 1

On the Cabin Pressurization Panel, what has occurred if both the amber AUTO FAIL light and the green ALTN light is illuminated?

Answer 1

a single channel controller failure has occurred

Question 2

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?

Answer 2

to land at the takeoff field elevation without further pilot inputs

Question 3

Which stages of the compressor section is bleed air is obtained from (NG aircraft)?

Answer 3

5th; 9th

Question 4

The ___ high-stage valve modulates open to maintain proper pressure when 5th low-stage pressure is
insufficient (NG aircraft).

Answer 4

9th

Question 5

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

Answer 5

pneumatically

Question 6

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

Answer 6

engine bleed air temperature or pressure exceeds a predetermined limit

Question 7

When the BLEED TRIP OFF light illuminates, what effect does this have on the engine bleed air system?

Answer 7

The respective engine bleed air valve closes automatically

Question 8

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.

Answer 8

closed

Question 9

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

Answer 9

open

Question 10

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

Answer 10

False

Question 11

The APU bleed air valve is___ operated and ______ activated.

Answer 11

pneumatically; DC

Question 12

Engine thrust must be _______ with the DUAL BLEED light illuminated.

Answer 12

limited to idle

Question 13

______causes a WING-BODY OVERHEAT condition.

Answer 13

a bleed air duct leak

Question 14

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

Answer 14

Left

Question 15

The isolation valve _________ if either engine BLEED air or air condition PACK switch is positioned OFF with
the ISOLOATION VALVE switch in AUTO.

Answer 15

automatically opens

Question 16

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

Answer 16

left pack

Question 17

Air from the left pack, air from the right pack, and air from the recirculation system is combined within the
_______.

Answer 17

mix manifold

Question 18

On the ground, the APU can supply air for ________ for all operations.

Answer 18

two packs

Question 19

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

Answer 19

the packs provide “normal air flow”

Question 20

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

Answer 20

the operating pack provides high air flow

Question 21

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

Answer 21

full cold

Question 22

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

Answer 22

air mix valves

Question 23

The automatic temperature controller is bypassed when the temperature selector is positioned to ________
on the B737-700,

Answer 23

MANUAL

Question 24

The ram air system is used to provide cooling for what part of the air conditioning systems?

Answer 24

heat exchangers

Question 25

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

Answer 25

full cold

Question 26

When a PACK TRIP OFF light illuminates, the pack valve ________ on the B737-700.

Answer 26

• automatically closes and the mix valve drives full cold

Question 27

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

Answer 27

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

Question 28

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

Answer 28

reduces

Question 29

What does the TRIP RESET switch reset?

Answer 29

• DUCT OVERHEAT on the B737-700, or the ZONE TEMP on the B737-800
• BLEED TRIP OFF, PACK TRIP OFF

Question 30

On the B737-800, what is indicated by the PACK light?

Answer 30

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

Question 31

Cabin air outflow controlled by______.

Answer 31

the outflow valve and the overboard exhaust valve

Question 32

On the Cabin Pressurization Panel, what does an illuminated amber AUTO FAIL light indicate?

Answer 32

automatic pressurization system failure is detected

Question 33

manually positioning the outflow valve to OPEN will cause cabin altitude to _________.

Answer 33

Climb

Question 34

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 _____ DC motors and

Answer 34

three

Question 35

On the cabin altitude panel, the ________on the CABIN Altimeter (ATL) / Differential Pressure (DIFF PRESS)
Indicator indicates the cabin altitude in feet.

Answer 35

• inner scale

Question 36

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

Answer 36

outer scale

Question 37

The intermittent cabin altitude warning horn can be cut out ______.

Answer 37

By pushing the Altitude (ATL) HORN CUTOUT Switch

Question 38

At _______ cabin altitude the intermittent cabin altitude warning will sound.

Answer 38

10,000 feet

Question 39

Cabin rate of climb displayed ______.

Answer 39

on the cabin rate of climb indicator

Question 40

On the Cabin Pressurization Panel, _______modes automatically pressurize the aircraft.

Answer 40

AUTO & ALTN