SDR UALA2011092705209

Service difficulty report · Fire Loop · Boeing 777222

Difficulty date: September 23, 2011
Submitted: October 13, 2011
Operation: Air carrier
Aircraft: N209UA
Make and model: Boeing 777222
Aircraft serial: 30215
Aircraft time: 50,024 hours, 6,368 cycles
Engine: Pwa PW40903
System (JASC): 2612 · Fire Detection
Part: Fire Loop
Condition: Shorted
Location: Apu Bay
Stage of operation: TX
How discovered: O
Nature of condition: N
Precautionary procedure: F

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

What was found

FIRE HANDLE WAS PULLED BY FLIGHT CREW DUE TO APU AUTO SHUT DOWN. BEFORE DEPARTURE APU AUTO SHUT DOWN, APU CONSIDERED INOPERATIVE. CREW PULLED HANDLE AND DISCHARGED FIRE EXTINGUISHER. REPLACED APU FIRE EXTINGUISHING BOTTLE AND SQUIB PER MM. BOTTLE PRESSURE SWITCH & BOTTLE SQUIB TESTS BOTH PASSED. REPLACED APU FIRE DET CARD PER MM. ALSO HAD MESSAGE 26-11230 (APU LOWER FIRE LOOP B SHORTED). REPLACED LOWER APU A&B LOOPS. MESSAGES CLEARED.