Service difficulty report · Warning Light · Boeing 747422

Difficulty date
April 3, 2004
Submitted
April 13, 2004
Operation
Air carrier
Aircraft
N177UA
Make and model
Boeing 747422
Aircraft serial
24384
Aircraft time
57,801 hours, 7,311 cycles
Engine
Pwa PW4056
Part
Warning Light
Condition
Illuminated
Location
Cargo Fire
Stage of operation
AP
How discovered
O
Nature of condition
J
Precautionary procedure
F

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

ON FINAL APPROACH FIRE CARGO AFT CAME ON. CREW USED ONE EXTINGUISHER BOTTLE. EMERGENCY EQUIPMENT STANDING BY. IN ADDITION TO THE "FIRE CARGO AFT" WARNING DURING DECENT, FLIGHT CREW OBSERVED STATUS MESSAGE "AFT CARGO 4 LP B". NRTMM FOUND STORED CMC FAIL MESSAGES FOR BOTH AFT CARGO 4 LP B AND AFT CARGO 3 LP A. FAILURES OF BOTH LOOP "A" AND "B" COULD ACCOUNT FOR FIRE CARGO AFT WARNING. GROUND INSPECTION FOUND NO EVIDENCE OF FIRE IN AFT CARGO PIT.