SDR UIEA2013071600367

Service difficulty report · Wire · Boeing 74747UF

Difficulty date: July 16, 2013
Submitted: July 16, 2013
Operation: Air carrier
Aircraft: N498MC
Make and model: Boeing 74747UF
Aircraft serial: 29259
Aircraft time: 60,512 hours, 9,057 cycles
System (JASC): 2697 · Fire Protection System Wiring
Part: Wire
Condition: Chafed
Location: Apu Fire Loop
Stage of operation: CR
How discovered: O
Nature of condition: N
Precautionary procedure: O

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

What was found

APU FIRE WARNING IN FLIGHT. REPLACED AFLOTS CARD, FIRE LOOP A, FIRE LOOP B, R8052 RELAY, R 7782 RELAY, MEGGED WIRING FROM D63P AND D67P TO DW3206E AND DW3205E, THEN REPLACED WIRING FROM BOTH FIRE LOOPS TO THE APU FIREWALL AFTER FINDING CHAFED WIRES UNDER THE CLAMPS.

More about the Boeing 747-47UF