Pneumatics/AirCon/Press

Question 1

EQUIP COOLING - OFF

Answer 1

Low airflow in the associated ducting. On the EXHAUST side can also mean a failure of the overboard valve.

Question 2

ZONE TEMP - CAB

Answer 2

• Failure of the primary and secondary flight deck controllers.
• Duct Overheat (trim air valve modulates closed)

On recall
-Failure of the Primary or Secondary controller

Question 3

ZONE TEMP

Answer 3

-Duct overheat (trim air modulates closed)

On recall
-Failure of controller

Question 4

DUAL BLEED

Answer 4

Indicates that the APU and ENG 1 Bleed Valve or APU and ENG 2 Bleed Valve and Isolation Valve are open. (Switch logic)

Question 5

RAM DOOR FULL OPEN

Answer 5

Indicates that the ram doors are full open. Should always be lit on the ground or in slow flight with the flaps extended.

Question 6

PACK

Answer 6

• Pack overheat (related pack flow control and SOV closes)
• Failure of the primary and secondary pack controller

On recall
-Failure of the primary or secondary pack controller

Question 7

WING-BODY OVERHEAT

Answer 7

Indicates high temperature in the area around bleed ducting (i.e. A bleed leak)

Question 8

BLEED TRIP OFF

Answer 8

Over temp or over pressure downstream of the associated engine bleed air PRSOV. Valve automatically closes.

Question 9

AUTOFAIL

Answer 9

• Failure of a pressurization controller
• Outflow valve failure
• DC motor failure
• loss of DC power
• Cabin Alt exceeding 15,800
• PSID exceeding 8.75
• Cabin rate of change exceeding 2000fpm

Question 10

OFF SCHED DESCENT

Answer 10

Descent is started prior to reaching 1000ft from preselected cruise altitude.
Cancels if you start to climb again, reset the FLT ALT window, or land.