SDR C8GA20080065

Service difficulty report · Fire Loop · Boeing 727223

Difficulty date: December 19, 2008
Submitted: December 23, 2008
Operation: Air carrier
Aircraft: N708AA
Make and model: Boeing 727223
Aircraft serial: 22465
Aircraft time: 60,119 hours, 32,203 cycles
System (JASC): 2612 · Fire Detection
Part: Fire Loop
Condition: Shorted
Location: Apu Bay
Stage of operation: DE
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

FLT 716. ON DECENT THE APU FIRE LIGHT ILLUMINATED AND THE MASTER FIRE BELL SOUNDED. THE APPROPRIATE CHECKLIST ACCOMPLISHED. THE APU FIRE BOTTLE WAS DISCHARGED. EMERGENCY WAS DECLARED. THE AIRCRAFT LANDED WITHOUT INCIDENT. POST FLIGHT INSPECTION REVEALED THAT THE APU FIRE LOOP SYSTEM WAS SHORTED. FURTHER TROUBLESHOOTING FOUND MINOR SURFACE CORROSION ON DIODE R421 CONNECTOR, CLEANED CONNECTOR, SYSTEM OPS CHECK GOOD. NO OTHER DEFECTS NOTED. AIRCRAFT WAS RETURNED TO SERVICE.