Service difficulty report · Generator · Boeing 757*

Difficulty date
March 21, 2022
Submitted
March 21, 2022
Operation
Air carrier
Aircraft
N57863
Make and model
Boeing 757*
Aircraft serial
32587
Aircraft time
64,191 hours, 19,459 cycles
Part
Generator
Part number
NA
Condition
Fluctuates
Location
Lh
Stage of operation
UK
How discovered
O
Nature of condition
O
Precautionary procedure
A

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

What was found

LEFT GEN OFF IN FLIGHT AFTER POWER FLUCTUATIONS STEP AV.(E) GOOD @ 1.6 OHMS, 60DEG F. LOCKED FOR FINDINGS. SFOMM WORKING ITEM BPCU SHOWS LEFT GEN FAULTS: "OVER FREQ TRIP" AND FOUND 3 WIRES CHAFFED 8" FROM IDG CONNECTOR. REPAIRING PER AMM. ACCOMPLISHED WIRING CHKS REF FIM 24-20 TASK 802, STEP AV FOR FOUND DAMAGE TO W5012-2001R-18, W5012-2001B-18 AND W5012-0004-20 "IDG/PMG/WIRING" . SEE FIM 24-20 TASK 802 PARA BL. PAGE 42. IDG/PMG/WIRING MESSAGE. WIRES CHKED PER WD 24-21-11-5 BETWEEN 3 INCHS FROM CONNECTOR D1394P REF WD 71-51-21. DAMAGE WAS PHOTOS ADDED. IDG PMG AND GCU. CHKS INCLUDED WIRE TO WIRE, WIRE TO GND AND THROUGH INSULATION ONLY WITH NO STRANDS DAMAGED. CREATED LOG CONTINUITY WITH MEGGER. NO PROBLEMS FOUND. RESISTANCE OF PMG REF PAGE 8203502 FOR REPAIR. DAMAGED WIRES REPAIRED ON LOG PAGE 8203502. ACCOMPLISHED 24-22-00-745-058 GOOD WITH NO FAULTS. OPERATIONAL TEST OF LEFT IDG REF AMM TASK 24-11-00-710-801. TESTS PASS DURING 5 MIN IDLE RUN WITH NO POWER FLUCTUATIONS NOTED. BPCU BITE TEST FOLLOWING RUN REF AMM TASK ADD EMP:101154