SDR DALA2018041302421

Service difficulty report · Electrical Sys · Boeing 757251

Difficulty date: April 12, 2018
Submitted: April 13, 2018
Operation: Air carrier
Aircraft: N546US
Make and model: Boeing 757251
Aircraft serial: 26493
Aircraft time: 69,433 hours, 21,940 cycles
System (JASC): 2410 · Alternator-Generator Drive
Part: Electrical Sys
Condition: Power Loss
Stage of operation: CR
How discovered: O
Nature of condition: H
Precautionary procedure: A

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

What was found

AIR TURNBACK DUE TO A LOSS OF ALL ELECTRICAL POWER, THE AUTOPILOT DISCONNECTED AND BOTH EICAS SCREENS WERE BLANK, SELECTED EMERGENCY POWER. LEFT GENERATION SYSTEM FAILED WITH NO AUTOMATIC TRANSFER TO RIGHT AND STBY POWER DID NOT COME ON. THE APU WAS STARTED AND NORMAL POWER WAS RESTORED. RAN THE QRH FOR GENERATOR OFF. CREW DECLARED AN EMERGENCY AND LANDED. R & R THE K109 RELAY, C901 LT GEN CIRCUIT BREAKER IAW AMM 24-22. R & R THE LT IDG, GCU, AND BPCU IAW AMM 24-22. OPS CHECKED GOOD.