Air Conditioning

Question 1

The ram air doors normally modulate to full OPEN when the aircraft is ____.

Answer 1

in flight with flaps not fully retracted or on the ground

Question 2

The APU can supply bleed air for the pack up to ____.

Answer 2

17,000 feet or 10,000 feet if the APU is also providing electricity

Question 3

The mix manifold receives air from the ____.

Answer 3

left pack, right pack, recirculation fan, and pre-conditioned air

Question 4

What is the primary source of conditioned air for the cockpit?

Answer 4

Left pack

Question 5

The primary purpose of the recirculation fans is to ____.

Answer 5

reduce air conditioning pack load

Question 6

Equipment cooling is provided for electronic equipment in the ____.

Answer 6

E & E bay and flight deck area

Question 7

The equipment cooling system has ___________ fan(s).

Answer 7

2 supply and 2 exhaust

Question 8

Air from the preconditioned ground source enters the air conditioning system through the ____.

Answer 8

mix manifold

Question 9

Engine low pressure bleed air is provided by the ____ stage, and engine high pressure bleed air is provided by the ____ stage air.

Answer 9

5th/9th

Question 10

Each A/C pack has ____ controllers for pack temperature control.

Answer 10

2

Question 11

If the primary equipment cooling fan fails, what indications would be displayed?

Answer 11

Master Caution light, the related equipment cooling OFF light, and the OVERHEAD annunciator light on the System Annunciator Panel

Question 12

In the event of a single pack failure at altitude, the remaining pack is capable of maintaining cabin pressure and comfort at an airplane altitude of _____.

Answer 12

41,000 feet

Question 13

The APU will supply bleed air for ____ pack(s) ____.

Answer 13

one, only in flight
&
both, on the ground

Question 14

Inflight, normal air conditioning system operation would be ____.

Answer 14

each pack from its associated engine bleed source

Question 15

Which single bleed source is permitted to supply air to both packs on the ground?

Answer 15

An engine bleed or APU.

Question 16

The ram air system operates automatically to provide cooling for ____.

Answer 16

the PACK heat exchangers

Question 17

For maximum cooling (of the pack) the ram air inlet doors modulate toward the _________ .

Answer 17

full open position

Question 18

Deflector doors on the ram air system are used on the ground to __________.

Answer 18

prevent slush ingestion on takeoff or landing

Question 19

The deflector doors on the ram air system are fully extended ____.

Answer 19

on the ground only

Question 20

Zone temperature is controlled by introducing the proper amount of trim air into the______________.

Answer 20

individual zone supply duct

Question 21

Failure of the primary and standby flight deck zone temperature controls will cause the ____ to illuminate.

Answer 21

ZONE TEMP, MASTER CAUTION, and AIR COND annunciator lights

Question 22

Inflight, the forward cargo compartment is heated by air drawn around it by the ____.

Answer 22

recirculation fan system
&
equipment cooling system

Question 23

The temperature selector adjusts the desired zone temperature between a range of approximately ____ degrees.

Answer 23

65-85

Question 24

When either the primary or standby pack temperature controller fails, what indications will be displayed?

Answer 24

PACK, MASTER CAUTION, and AIR COND SYSTEM ANNUNCIATOR lights on recall

Question 25

If the FWD or AFT Cab ZONE TEMP lights illuminate indicating an overheat, this will cause the associated ____ valve to close.

Answer 25

trim air modulating

Question 26

The associated PACK light, Master Caution, and AIR COND annunciator will illuminate when ______.

Answer 26

pack overheats or dual pack controller failure

Question 27

What fault indication(s) cannot be reset with the trip reset button?

Answer 27

Wing body overheat

Question 28

The ZONE TEMP light, Master Caution, and AIR COND annunciator lights will illuminate for

Answer 28

• an overheat in the duct leading to any of the three zones
• a dual temperature controller failure in the CONTROL CAB zone
• any single temperature controller failure in any zone during a RECALL test

Question 29

Taking off with one or both PACK switches in HIGH is allowed with the engine bleed air switches on.

Answer 29

False

Question 30

Placing the trim air switch off will:

Answer 30

• Close the trim pressure regulating and shutoff valve
• Cause the left pack temp to be controlled by the Cont -Cab temp selector and the right pack by the Fwd and Aft temp selectors