Ch.2 (Air Systems)

Question 1

What does the BLEED TRIP OFF (amber) light indicate?

Answer 1

The bleed trip sensors have automatically closed the Engine Bleed Air Valve due to bleed air high temp or high press. Bleed trip off light causes the AIR COND annunciator and Master Caution lights to illuminate.

Question 2

Condition permitting, the TRIP RESET switch reset which lights?.

Answer 2

The bleed trip off light, ZONE TEMP, and PACK lights. This will reset the trip condition as long as the exceedances no longer exist

Question 3

How does the ISOLATION VALVE operate with its switch in AUTO?

Answer 3

In auto, the Isolation valve is positioned by switching the Engine bleed and Pack switches. Placing any one of these switches in OFF will automatically open the isolation valve. Isolation valve will be closed when:

• both engine bleed switches are ON and/or
• both pack switches are in AUTO or HIGH.

Question 4

What precautions apply with the APU Bleed Valve when an engine bleed valve is open?

Answer 4

Possibility of engine bleed air back pressure to the APU if the APU Check valve fails

Question 5

When does the DUAL BLEED (amber) light illuminate?

Answer 5

APU bleed air valve is open and either engine bleed switch is positioned ON

Question 6

What does the WING-BODY OVERHEAT (amber) light indicate?

Answer 6

An overheat has been detected. AIR COND annunciator and MASTER CAUTION also illuminate.

Question 7

A single pack in high flow mode is capable of maintaining pressurization and acceptable
temperatures throughout the aircraft up to what altitude?

Answer 7

Max certified ceiling. FL410.

Question 8

Which valve pneumatically modulates to control airflow into the respective air conditioning pack based on air conditioning demands?

Answer 8

The pack valves. (Flow control and shutoff valves)

Question 9

When does a pack automatically switch to high air flow?

Answer 9

• With one pack not operating, the other pack auto switches to high airflow. This is
  inhibited on the ground and in the air with flaps extended to maintain adequate
  engine power for single engine operation.
• Both Engine bleed switches OFF and APU bleed switch ON regardless of air/ground
  status or number of packs operating.

Question 10

How do the Recirculation fans operate with both RECIRC FAN switches in AUTO, and both
PACK switches in AUTO?

Answer 10

Both recirc fans are on on the ground and in the air.

Question 11

Where do air recirculation fans draw air from?

Answer 11

• Left: Air condition distribution compartment

- Right: Cabin air through the floor grilles on each side of the passenger cabin.

Question 12

What does illumination of a ZONE TEMP (amber) light indicate?

Answer 12

• Supply duct over heat (associated Trim air modulating valve closes)
• Failure of both primary and standby temperature controls
• During Master Caution recall, indicates a failure of the primary or standby temp
  control (Auto switch the the back up in this case)

Question 13

How do you position PACK switches when using external conditioned air?

Answer 13

Pack switches OFF

Question 14

What controls the temperature of conditioned air from an external source?

Answer 14

The external air conditioner temp control

Question 15

Packs produce air temperature to satisfy which zone?

Answer 15

The zone that is set to the lowest temperature

Question 16

What happens with a failure of the primary flight deck zone temperature control?

Answer 16

The left electronic controller provides backup for the flight deck temp control

Question 17

What temperatures are commanded by positioning all zone temperature selectors to off?

Answer 17

• Left pack: Fixed temp of 75F (24C)

- Right Pack: Fixed temp of 65F (18C)

Question 18

What provides an equipment cooling alert if an over temperature occurs on the ground?

Answer 18

Crew call horn located in the nose wheel well

Question 19

What is the purpose of the Overboard Exhaust Valve (OEV)?

Answer 19

Exhausts the hot air from equipment cooling and provides a smoke removal mode

Question 20

When is the Outflow valve position indicator operational?

Answer 20

All da time frien

Question 21

When does the OFF SCHED DESCENT (amber) illuminate?

Answer 21

If the aircraft begins to descend without having reached the preset cruise altitude. AIR COND annunciator and MASTER CAUSTION also illuminate. Controller auto programs departure field elevation.

Question 22

How is pressurization controlled with Cabin Pressurization Mode Selector in MAN?

Answer 22

With the outflow valve position switch which manually drives the outflow valve open or closed through the use of a dc motor.

Question 23

What two warnings use the same aural tone (intermittent horn) when activated?

Answer 23

The cabin altitude and takeoff configuration warnings