Service difficulty report · Fire Loop · Boeing 747451

Difficulty date
January 16, 2007
Submitted
January 23, 2007
Operation
Air carrier
Aircraft
N105UA
Make and model
Boeing 747451
Aircraft serial
26473
Aircraft time
51,321 hours, 6,270 cycles
Engine
Pwa PW4056
Part
Fire Loop
Part number
2156656
Condition
False Indication
Location
Cargo Bay
Stage of operation
CR
How discovered
O
Nature of condition
N
Precautionary procedure
F, A

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

What was found

FLIGHT DIVERTED DUE TO FWD CARGO FIRE WARNING. SUPPLEMENTAL DATA UPDATE FWD CARGO RED FIRE WARNING ILLUM DURING CRUISE. ARMED & DISCHARGED FIRE BOTTLES. ACFT DIVERTED TO APW WESTERN SAMOA. NO EVIDENCE OF FIRE DISCOVERED. IDENTIFIED FAULTS IN BOTH A & B LOOPS. REPLACED BOTH SMOKE DETECTORS. OP CHECKED OK. RETURNED TO SERVICE. SUSPECT MOISTURE CONDENSED IN SENSING TUBES LEADING TO FALSE SMOKE READINGS. CARGO INCLUDED BEES & DRY-ICE COOLED CARGO.