Amber lights

Question 1

WING-BODY OVERHEAT

Answer 1

Duct overheat in
Left- associated engine strut, inboard wing leading edge, AC bay, keel beam, or APU bleed duct

Right-engine strut, inboard wing, or AC bay

Question 2

BLEED TRIP OFF

Answer 2

Excessive temp or pressure
-related bleed valve closes
-requires reset

Question 3

PACK

Answer 3

Pack overheat, or
failure of both primary and secondary pack controls

On recall: primary or secondary pack controller failed

Question 4

ZONE TEMP

Answer 4

CONT CAB: duct overheat, or
Primary and secondary temp controls failed
FWD CAB or AFT CAB: duct overheat

On recall:
CONT CAB: failure of primary OR secondary temp controller
FWD CAB or AFT CAB: associated controller failed

Question 5

COWL ANTI ICE

Answer 5

Duct overpressure downstream of valve

Question 6

ELEC light

Answer 6

DC or standby power system failure
-DO NOT TAKEOFF

Question 7

APU LOW OIL PRESSURE

Answer 7

APU oil pressure low
Auto shut down

Question 8

APU OVERSPEED

Answer 8

APU rpm limit exceed- auto shutdown
During shut down, APU shutdown protection logic fails self test
Light extinguishes after 5mins

Question 9

APU FAULT

Answer 9

Apu malfunction occurs (ex: no APU GEN OFF BUS light at end of APU startup)
-auto shut down

Question 10

SOURCE OFF

Answer 10

Transfer bus not powered by previously selected source

Question 11

STANDBY POWER OFF

Answer 11

One or more are not powered
AC standby
DC standby
Battery bus

Question 12

TR UNIT

Answer 12

Ground: any TR unit fails
Airborne: TR 1 or TR 2 and 3 failed

Question 13

TRANSFER BUS OFF

Answer 13

The transfer bus not powered