Chapter 1: Air Conditioning/Pressurization

Question 1

The ram-air doors are fully open in flight under which conditions?

Answer 1

Slow-flight with the flaps not fully retracted.

Question 2

When are the ram-air doors fully open?

Answer 2

On the ground or during slow flight with flaps not fully retracted.

Question 3

What is the source of barometric pressure used by the pressurization system auto contollers?

Answer 3

The ADIRUs.

Question 4

If the controller is not responding, the AUTO FAIL warning light on the Cabin Pressurization panel will illuminate if the cabin rate of descent or climb exceeds…?

Answer 4

± 2000 FPM

Question 5

The OVHT TEST push button switch on the Bleed Air Panel tests which circuits?

Answer 5

The wing body overheat circuits.

Question 6

The recirculation fan is powered by an AC or a DC motor?

Answer 6

AC motor.

Question 7

How much time is required to drive the pressurization outflow valve through its full range using manual control?

Answer 7

20 seconds

Question 8

Duct overheat detection for the left pack is located…

Answer 8

In the duct leading from the left pack to the Flight Deck.

Question 9

What is the maximum altitude that may be set in the FLT ALT windows on the Cabin Pressurization panel?

Answer 9

42,000’

Question 10

A BLEED TRIP OFF is caused by…

Answer 10

…either an over-temperature or an over-pressure condition.

Question 11

If the automatic temperature controller fails, what happens to the mix valves, and can they be controlled?

Answer 11

The mix valves stay at the last setting and can be controlled in manual.

Question 12

If the pressurization controller is not responding, the AUTO FAIL warning light on the Cabin Pressurization panel will illuminate when the cabin differential pressure exceeds…

Answer 12

…8.75 psi.

Question 13

In normal cruise the air conditioning ram air doors…

Answer 13

… modulate between open and closed according to cooling requirements.

Question 14

Will the APU bleed valve open when the APU bleed switch is positioned to ON?

Answer 14

Yes, but only if the APU is operating.

Question 15

The 9th-stage bleed air valve acts as a temperature and pressure regulator or as a modulation and shut-off valve?

Answer 15

A modulation and shut-off valve.

Question 16

If a pack valve closes, what is the effect on the respective mix valve?

Answer 16

The mix valve drives full cold.

Question 17

What is the primary source of conditioned air for the Flight Deck?

Answer 17

The left pack.

Question 18

The ram air system deflector doors are electrically extended…

Answer 18

… when activated by the ground safety sensor.

Question 19

What is the normal position of the isolation valve when the Isolation Valve switch is in AUTO?

Answer 19

Closed

Question 20

Why is throttle position used by the automatic pressurization contollers?

Answer 20

To de-pressurize the cabin at lower power settings on the ground.

Question 21

The source of bleed air is provided by…

Answer 21

The 5th-stage of the compressor section augmented by the 9th-stage.

Question 22

What is the source of the heated airflow to the mix-manifold coming from the forward cargo compartment?

Answer 22

Air routed through the Flight Deck electronics and the E & E compartment.

Question 23

The engine bleed valve is operated by…

Answer 23

A DC motor and bleed air pressure.

Question 24

The mix valve position indicators indicate…

Answer 24

the actual position of the mix valve in both manual and automatic mode.

Question 25

The 5th-stage bleed air valve acts as a...

Answer 25

pressure regulator and shutoff valve.

Question 26

If both the AUTO FAIL and MANUAL warning lights on the Cabin Pressurization panel are illuminated, what is indicated with respect to the automatic controllers?

Answer 26

A single controller has failed and pressurization has automatically switched to the operating controller.

Question 27

What is the maximum negative cabin pressure differential?

Answer 27

0.125 psi

Question 28

What is indicated if the AUTO FAIL warning light is illuminated on the Cabin Pressure panel with regard to the automatic controllers?

Answer 28

Both controllers have failed.

Question 29

When the recirc fan switch is in AUTO the fan will operate...

Answer 29

continuously, except with both Packs on and one or both in HIGH.

Question 30

What cabin altitude is the cabin regulated to at FL410?

Answer 30

8000'

Question 31

The PACK TRIP OFF warning light indicates which condition?

Answer 31

The pack temperature has exceeded limits.

Question 32

What is the maximum altitude that may be set in the LAND ALT windows on the Cabin Pressurization panel?

Answer 32

14,000'

Question 33

Using the engine bleed air, when will a pack automatically switch to HIGH?

Answer 33

In flight with one pack not operating with flaps up and the pack switches in AUTO.

Question 34

What is the maximum allowable differential pressure?

Answer 34

9.10 psi

Question 35

An overheat in the APU bleed air duct will illuminate which warning light on the Bleed Air Panel?

Answer 35

The left WING-BODY OVERHEAT warning light.

Question 36

With the Isolation Valve switch in AUTO, what will cause the isolation valve to open?

Answer 36

Positioning either engine bleed or either pack switch to OFF.

Question 37

If the controller is not responding, the AUTO FAIL warning light on the Cabin Pressurization panel will illuminate if the cabin altitude exceeds...

Answer 37

15,800'

Question 38

The duct overheat will...

Answer 38

cause both mix valves to drive full cold and illuminate the DUCT OVERHEAT light.

Question 39

What is indicated by the OFF SCHED DESCENT warning on the Cabin Pressurization panel?

Answer 39

The aircraft has descended before reaching the planned cruise altitude as set in the FLT ALT indicator.

Question 40

What will cause illumination of the DUAL BLEED warning?

Answer 40

The APU bleed air valve is open, and the number 1 engine bleed switch is ON, or the number 2 engine bleed switch is ON, and the isolation valve is open.

Question 41

How is the bleed air from the engine initially cooled for the cabin temperature control?

Answer 41

A heat exchanger in the ram air system.

Question 42

If the aircraft must do an emergency RTB, what is the landing altitude as programmed by the automatic controller?

Answer 42

The cabin altitude as sensed by the controller before take-off.

Question 43

The TRIP RESET on the Bleed Air Panel will reset which condition(s)?

Answer 43

PACK TRIP OFF and BLEED TRIP OFF.

Question 44

The BLEED TRIP OFF light illuminated indicates what condition(s)?

Answer 44

Excessive engine bleed air temperature or pressure.

Question 45

If only one pack is operating, the operating pack will regulate to high flow with the pack switch in AUTO under what conditions?

Answer 45

When operating the pack with the APU as the only bleed source or in-flight with the flaps up.

Question 46

Duct overheat detection for the right pack is located...

Answer 46

in the duct leading from the mix manifold to the sidewall riser.