What was found
AFTER TAKE-OFF FROM NRT, INDICATION, AC BUS 1 FAIL, RETURNED TO NRT, MAINTENANCE PERFORMED PER FIM 24-23 TASK 812, REMOVED AND REPLACED BCU, TESTED EPGS (GCU1) AND EPGS 2 (GCU2) GROUND TEST COMPLIED WITH, TEST PASSED.
- Difficulty date
- May 21, 2026
- Submitted
- May 21, 2026
- Operation
- Air carrier
- Aircraft
- N344KD
- Make and model
- Boeing 747446
- Aircraft serial
- 26344
- Aircraft time
- 98,376 hours, 18,668 cycles
- System (JASC)
- 2450 · AC Power Distribution System
- Part
- Buss Protection
- Part number
- 746013J
- Part serial
- 0536
- Condition
- Faulty
- Location
- Zone 100
- Stage of operation
- CL
- 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.