AIR

Question 1

If the APU bleed is left on during climb, when will it automatically close?

Answer 1

closes at 25,000ft and reopens at 23,000ft

Question 2

How many pack controllers? what if they fail?

Answer 2

1 controller per pack. If it fails, the pack outlet temp will be regulated between 48 and 59 degrees F

Question 3

What happens if a Zone controller fails? How many channels?

Answer 3

Two channels. If the zone controller fails, the temp will be regulated to 68 degrees F

Question 4

When should you select the Pack flow to Low? (80%)
What are the other settings?

Answer 4

When less than 60% of economy is occupied. Less than 200 Pax total all zones.
Norm 100% or auto (mcdu input)
High - 120% - for hot and humid conditions

Question 5

What is the pack flow on the ground with APU on?

Answer 5

125%

Question 6

How is the FWD cargo temp controlled?

Answer 6

Heated from the left (hot 1) cooled from the right (pack 2)

Question 7

How is the cockpit heated?

Answer 7

Hot air 1, via a restricter valve

Question 8

Ram air on the left lower side of the fuselage. Purposes?

Answer 8

Used in case of dual pack failure.
Used for Smoke Fire Fumes QRH procedure.
Will not open if Delta P is greater than 1.
Ram air Pb does not work if ditching Pb is selected. (OCRAP)