SDR UALA2011080204005

Service difficulty report · Idg · Boeing 767322

Difficulty date: August 1, 2011
Submitted: August 3, 2011
Operation: Air carrier
Aircraft: N663UA
Make and model: Boeing 767322
Aircraft serial: 27160
Aircraft time: 78,808 hours, 12,785 cycles
Engine: Pwa PW4060
System (JASC): 2421 · AC Generator-Alternator
Part: Idg
Condition: Failed
Location: Nr 1 Engine
Stage of operation: TX
How discovered: O
Nature of condition: O
Precautionary procedure: D

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

What was found

CREW REPORT: JUST PRIOR TO TAKING RUNWAY L AC BUS FAILED. ACP TROUBLESHOOTING PER TABLE 102 REF MM P163 FOR DP TRIP AND MAIN BUS-OVERLAP. ALL WIRE CHECKS SAT. CREW ALSO REPORTED THE LEFT GENERATOR CONTROL TRIPPED AND THE LEFT TIE BUS ALSO FAILED. BOTH THE LEFT GEN CONTROL AND TIE BUS WERE ABLE TO BE RESET. WHEN THE LEFT AC BUS WAS NOT POWERED THE RIGHT GEN POWER DIDN'T AUTO TRANSFER TO THE LEFT AC BUS. REMOVED AND REPLACED NR 1 ENG IDG PER MM. OPS CHECKED GOOD. NO LEAKS.