Pressurization/Air systems

Question 1

Can the APU provide bleed air in flight? If so, up to what altitude?

(FCOM 2.40.1)

Answer 1

Yes. 22,000’

Question 2

What causes the Equipment Cooling to go into OVRD mode?

(FCOM 2.20.6)

Answer 2

1. Both equipment cooling supply fans are failed (inflight), or
2. Low airflow is detected (inflight), or
3. Smoke is detected in the forward equipment cooling or ventilation system, or
4. The EQUIPMENT COOLING switch is in OVRD,or
5. The LWR, FWD, or AFT CARGO FIRE ARM switch is ARMED.

Question 3

What is the temp range of the flight deck with the selector in Auto?

(FCOM 2.20.3)

Answer 3

65-85 F

Question 4

When would you need to push the AIR COND RESET switch?

(FCOM 2.20.1)

Answer 4

• Pack valve or trim air valve closed due to an overheat, valve failure, or controller failure.
• Recirc fan failure
• Reset fault protection

Question 5

What are the Landing Field limits with the Landing Alt knob pushed in?

(FCOM 2.30.2)

Answer 5

-1000 to 14,000’ above sea level

Question 6

The center isolation valve is normally closed except when?

(FCOM 2.40.2)

Answer 6

Engine start or single bleed source.

Question 7

APU bleed air is supplied to which duct?

(FCOM 2.40.3)

Answer 7

Left.

Question 8

Where is Duct Pressure displayed?

(FCOM 2.40.3)

Answer 8

Secondary EICAS or Air Synoptic.

Question 9

Under normal conditions, air is vented out through which outflow valve?

(FCOM 2.30.1)

Answer 9

Mostly through the aft outflow valve.

Question 10

Pressurization system indications are displayed when?

(FCOM 2.10.9)

Answer 10

1. Landing altitude MAN is displayed.
2. Either OUTFLOW VALVE switch is in MAN.
3. Cabin altitude is in amber above normal range or in red excessive range.
4. Cabin differential pressure is in amber above normal range or in red excessive range.
5. Duct pressure is in amber below normal range with the respective engine running.
6. The AIR synoptic switch is pushed.
7. Any of the following EICAS messages are displayed:
   * CABIN ALTITUDE
   * CABIN ALTITUDE AUTO
   * LANDING ALTITUDE
   * OUTFLOW VALVE AFT
   * OUTFLOW VALVE FWD