SDR 2005UALA01464

Service difficulty report · Wire · Boeing 777222

Difficulty date: December 12, 2005
Submitted: December 20, 2005
Operation: Air carrier
Make and model: Boeing 777222
Aircraft serial: 26939
Aircraft time: 38,109 hours, 5,993 cycles
Engine: Pwa PW4090
System (JASC): 2497 · Electrical Power System Wiring
Part: Wire
Condition: Burned
Location: Idg
Stage of operation: IN
How discovered: V
Nature of condition: O
Precautionary procedure: K

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

What was found

NR 2 ENG IDG WIRING BURNED. NR 2 ENG IDG FEEDER CABLE TERMINAL LUGS FOUND CORRODED AT ENG DISCONNECT. REPLACED LUGS. ALSO FOUND GENERATOR FEEDER CABLE BURNED & CHAFED AT TERMINAL STRIP. SPLICED IN 3 FT SECTION OF NR 2 CU WIRE. REPLACED FEEDER CABLE SEALS AND SUPPORTS. RE-POTTED WHERE CABLE FEEDS THRU TOP OF J-BOX. CABLE TERMINALS EXPERIENCE THERMAL DISTRESS WHEN CORRODED CONNECTIONS INCREASE CURRENT FLOW. HIGHER TEMPERATURES CAUSE SEALS, POTTING & INSULATION TO OXIDIZE & DETERIORATE.