Message Level Notes Condition MEL Item
APU BTL 1 Advisory Option APU bottle 1 low pressure. 26-20-1
26-22-1
APU BTL 2 Advisory Option APU bottle 2 low pressure. 26-20-1
26-22-1
APU DOOR Status Basic APU door disagree with selected 49-15-1
position.
APU FAULT Advisory Basic APU automatic fault shutdown. 49-11-1
APU FIRE Warning Basic APU fire. 26-15-1
APU FIRE LP 1 Status Basic APU fire loop 1 fire or fault
output.
APU FIRE LP 2 Status Basic APU fire loop 2 fire or fault
output.
APU FUEL VAL Advisory Basic APU fuel valve disagrees with
commanded position.
APU GEN OFF Advisory Basic APU generator auxiliary power
breaker (APB) open with APU running and external power contactor (EPC) open or APU generator control switch off.
APU OIL QTY Status Basic APU oil quantity low level switch
detects 30 hours run time remaining with APU running.
ATC Comm E Basic An ATC data link message has
been received.
ATC DATALINK LOST Advisory Basic An established ATC datalink has
been lost.
ATC FAULT Advisory Basic Air traffic control transponder
fault.
ATT DISAGREE Caution Option Instrument comparator senses
left and right attitude disagreement.
ATT FAIL Advisory Prov’n Instrument comparator unit
senses invalid attitude data.
AUTO SPEEDBRAKE Advisory Basic Auto speedbrake system detects
fault.
Message
Level Notes Condition
AUTOBRAKES Advisory Basic Autobrake disarmed or inoperative.
AUTOPILOT Caution Basic Loss of ADC, stab trim, ILS, or
RA inputs to active autopilot.
34-33-1
34-61-1
AUTOPILOT DISC Warning Basic Loss of all engaged autopilots. 22-10-1
AUTOTHROT DISC Caution Basic Manual or automatic 22-30-1
disengagement of autothrottle or
failure to remove power from
autothrottle servo.
BATTERY OFF Advisory Basic Battery switch off. N/A
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