Air Cond / Press

Question 1

MAN duct temperature range

Answer 1

2.8C to 71C

Question 2

Auto cabin and flight deck zone temp range

Answer 2

15C and 27C

Question 3

Explain avionics cooling

Answer 3

Draws air over avionics using fans
Main DC busses powered Fan 1 and 2 ON, Fan 3 standby
If Fan 1 or Fan 2 fail, Fan 3 operates, no notice to flight crew, fault logged in CDS for MX
Under battery power, fan 1 low speed fan 2 off, fan 2 low speed if fan 1 fails
Two fans fail on ground, AVIONICS caution, FANS FAIL message
Two fans fail in flight, FANS FAIL message

Question 4

Explain Aft Outflow Valve

Answer 4

Electrically controlled and regulated by the Cabin Pressure Controller. It is the primary valve, used for both auto and man, can be used to dump cabin

Question 5

Explain Aft Safety Outflow Valve

Answer 5

Electro-pneumatic valve supplies venting during ground ops. Opens when at least one engine is running at idle or the APU air is turned on

Question 6

Explain Forward Safety Outflow Valve

Answer 6

Pneumatic valve used for emerg ops. Incorporates pos and neg pressure relief valve. Automatically released cabin pressure when preset limits are reached.

Question 7

How long until you need to reset LDG ALT for a return?

Answer 7

10 mins

Question 8

When will CABIN PRESS come on?

Answer 8

Cabin Altitude has exceeded 9,800 ft