# SDR 2002F00466

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 6, 2002
- Submitted: May 9, 2002
- Operation: Air carrier
- Aircraft: N519AT
- Make and model: Boeing 757-23N
- Registry model: [Boeing 757-23N](https://openairdocs.org/model/boeing-757-23n) (OpenAirDocs)
- Aircraft serial: 27975
- Aircraft time: 27,975 hours, 5,354 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Exciter
- Part number: 106170756D
- Part serial: 85038230
- Condition: Failed
- Location: Apu
- Part time: 16,914 hours, 5,354 cycles
- Stage of operation: CR
- How discovered: C
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2002F00466

## Discrepancy

FLIGHT NUMBER 126, DURING CRUISE APU FAILED TO START DURING INFLIGHT START VERIFICATION (5 ATTEMPTS).  MAINTENANCE TROUBLESHOT PER FIM 49-11-00 TO FAULTY EXCITER UNIT.  REMOVED AND REPLACED IGNITION EXCITER IN ACCORDANCE WITH MM 49-41-03.  APU OPERATIONAL CHECKS GOOD.

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