SDR AALA202212142024

Service difficulty report · Gcu · Boeing 737823

Difficulty date: December 12, 2022
Submitted: December 14, 2022
Operation: Air carrier
Aircraft: N915AN
Make and model: Boeing 737823
Aircraft serial: 29516
Aircraft time: 61,813 hours, 25,546 cycles
System (JASC): 2421 · AC Generator-Alternator
Part: Gcu
Part number: 762185J
Condition: Faulted
Stage of operation: CL
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

AIRCRAFT WAS GROUNDED: CLIMBING THRU FIGHT LEVEL 340 EXPERIENCED A LOSS OF ELECTRICAL POWER. STARTED APU; PLACED APU ON LEFT TRANSFER BUS. FLIGHT DECLARED AN EMERGENCY AND RETURNED TO CLT LANDING SAFELY. MAINTENANCE REPLACED GENERATOR CONTROL UNITS #1 (AALA202212142024) AND #2 (AALA202212142315) PER AMM 24-21-81. REPLACED BUS TIE BREAKERS #1 (AALA202212145920) AND #2 (AALA202212145445) PER AMM 24-21-41. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECKS PER AMM 24-21-00-700-803.