# SDR CALA2012121700861

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 17, 2012
- Submitted: December 17, 2012
- Operation: Air carrier
- Aircraft: [N26902](https://openairdocs.org/aircraft/N26902), registered now
- Make and model: Boeing 787-8
- Registry model: [Boeing 787-8](https://openairdocs.org/model/boeing-787-8) (OpenAirDocs)
- Aircraft serial: 34822
- Aircraft time: 59 hours, 31 cycles
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Control Panel
- Part number: 7000053
- Part serial: 0237
- Condition: Inoperative
- Location: Generator
- Part time: 26 hours, 18 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: G, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2012121700861

## Discrepancy

R1 GENERATOR, RT ENGINE.  IAW NON NORMAL APU STARTED AND POWERED UP, IN APPROX 5 MIN APU LT GEN FAILED.  F/A REPORTED A LOUD BANG FROM UNDER FLOOR IN THE AREA OF DOOR 3L.  THIS IS CONTINUED ON LOG PAGE 7090676 TROUBLESHOT WIRING IAW ASSOCIATED FAULT CODES AND FIM TASKS, FOUND BAD R1 BUSS TIE BREAKER, BTB, CURRENT TRANSFORMER, CT, WITH LOW RESISTANCE. FLASH MARK BEHIND P200.  ON FURTHER INSPECTION BELOW RIGHT GCU SLOT FAULT DATA.

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