AIR COND

Question 1

ZONE TEMP

Answer 1

• CONT CAB – duct temp overheat or failure of the flight deck primary and standby temp control
• FWD/AFT CAB – duct temperature overheat
• During master caution light recall:
o CONT CAB – indicates failure of the flight deck primary or standby temperature control
o FWD/AFT – indicates failure of the associated zone temp control
o Light will extinguish when master caution reset

Question 2

DUAL BLEED

Answer 2

• APU bleed air valve open and engine No1 bleed air switch on or, No2 bleed air switch on, APU bleed air valve and isolation valve open

Question 3

PACK

Answer 3

• Indicates pack trip off or failure of both primary and standby pack controls
• During master caution recall, indicates failure of either primary or standby pack control. Extinguishes when master caution is reset

Question 4

WINGBODY OVERHEAT

Answer 4

• Left light indicates overheat from the bleed air duct leak in left engine strut, left inboard wing leading edge, left air conditioning bay, keel beam or APU bleed air duct
• Right light indicates overheat from bleed air duct leak in right engine strut, right inboard wing leading edge or right air conditioning bay

Question 5

BLEED TRIP OFF

Answer 5

• Excessive engine bleed air temperature or pressure
o Related engine bleed air valve closes automatically
o Requires reset

Question 6

AUTO FAIL

Answer 6

• Single controller failure when ALTN light is also shown

* Indicates dual controller failure when illuminated alone