Service difficulty report · Gcu · Boeing 7879

Difficulty date
February 8, 2021
Submitted
February 8, 2021
Operation
Air carrier
Aircraft
N29977
Make and model
Boeing 7879
Aircraft serial
66136
Aircraft time
3,524 hours, 424 cycles
Part
Gcu
Condition
Malfunctioned
Location
R1
Stage of operation
NR
How discovered
O
Nature of condition
J
Precautionary procedure
A

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

What was found

ELEC GEN CTRL UNIT R1 RIGHT 1 GENERATOR CONTROL UNIT (GCU) IS INOPERATIVE. FIM TASK REF : 24-20-F0-L7A-421A-A CMC MSG# 2419502 FLIGHT STATUS: A INTERMITTENCE CODE: H PH: CRUISE NARRATIVE: 24 BPCU GATEWAY OPS (LE FT) CMC MSG# 2416694 FLIGHT STATUS: A INTERMITTENCE CODE: M PH: CRUISE NARRATIVE: RIGHT 2 GENERATOR CONTR OL UNIT CMC MSG# 2416694 FLIGHT STATUS: A INTERMITTENCE CODE: M PH: CRUISE NARRATIVE: CREW ACCOMPLISHMENT OF CHECKLIST DID NOT RESET THE R1 GENERATOR. WITH APU OPERATING THE R1 MAIN BUS DID NOT PICK UP. EXPERIENCING MULTIPLE LOAD SHEDS INCLUDING MAINT MSG 21-65223 FOR RIGHT ACM, 21-65113 FOR R1 CAC NOT AVAIL AND 21-6517 FOR R2 CAC SURGE. UNLOCKING FOR ORDMM CORRECTIVE ACTION DOCUMENTATION. REF LOGPAGES 5823244, 5824054, AND 5825442. R1 GCU WAS REPLACED AND R1 VSFG WAS REPLACED WITH BOTH OPS CHECKING GOOD. MX MSG 24-19502 DID NOT RE-OCCUR REF DMC-B787-A-24-20-F2-ATA-421A-A NO FURTHER MX ACTION NEEDED AT THIS TIME

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