# SDR DL75E091060

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 22, 2009
- Submitted: June 26, 2009
- Operation: Air carrier
- Aircraft: [N721TW](https://openairdocs.org/aircraft/N721TW), registered now
- Make and model: Boeing 757231
- Aircraft serial: 29954
- Aircraft time: 32,196 hours, 11,295 cycles
- Engine: Pwa PW4060
- System (JASC): [2410 · Alternator-Generator Drive](https://openairdocs.org/jasc/2410)
- Part: Gcu
- Part number: 734284F
- Condition: Malfunctioned
- Location: Lt Engine
- Stage of operation: TX
- How discovered: O
- Nature of condition: O
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DL75E091060

## Discrepancy

LEFT ENGINE DRIVEN GEN DOES NOT POWER ELECTRICAL SYSTEM AFTER LEFT ENG START APU WAS SHUTDOWN AND ALL ELECTRICAL POWER WAS LOST LT/RT GEN SHOWS GCU ON BPCU. CLEAR BPCU AND RESEAT LT GCU RAN LT AND RT ENG GEN OPS AND INDICATION NORMAL OIL LEVEL NORMAL ON LT IDG  ETOPS CATEGORY 'E': PROBLEMS WITH SYSTEMS CRITICAL TO ETOPS

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