# SDR UIEA2018041200692

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 12, 2018
- Submitted: April 12, 2018
- Operation: Air carrier
- Aircraft: [N1409A](https://openairdocs.org/aircraft/N1409A), registered now
- Make and model: Boeing 767306
- Aircraft serial: 27960
- Aircraft time: 88,108 hours, 16,345 cycles
- System (JASC): [2424 · AC Regulator](https://openairdocs.org/jasc/2424)
- Part: Gcu
- Part number: 734284F
- Part serial: 7525
- Condition: Malfunctioned
- Stage of operation: AP
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2018041200692

## Discrepancy

R AC BUS FAILURE IN DESCENT, QRH PROC RESTORED PWR W/R ISL ILLUMINATED. PERFORMED BIT CHECK ON BPCU, FOUND DP TRIP/MAIN BUS/OVERLAP ZONE MESSAGE. REMOVED AND REPLACED RT GCU, OPERATIONAL CHECK GOOD IAW AMM 24-22-02.

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