# SDR IPXA11570575

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 9, 2011
- Submitted: December 12, 2011
- Operation: Air carrier
- Aircraft: [N402UP](https://openairdocs.org/aircraft/N402UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 23724
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Gearbox
- Condition: Failed
- Location: Apu
- Stage of operation: CR
- How discovered: O
- Nature of condition: G, H
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA11570575

## Discrepancy

RT GENERATOR OFF LIGHT ON TAKEOFF.  LT AND RT UTILITY BUSSES TRIPPED,  APU SHUTDOWN WITH APU FAULT.  EMERGENCY DECLARED.  TROUBLESHOT APU IAW FIM 49-11-00-815-855-001,  FOUND OIL COOLING FAN DRIVE GEARS AND APU GEARBOX DRIVE GEARS DAMAGED IAW STEP 5 AND 13 OF FIM.  R & R APU IAW AMM 49-11-01-4 AND TASK CARD NR 5000. LEAK AND OPS CHECKED GOOD IAW AMM 49-11-00-2.

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