# SDR UIEA2021031100521

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 11, 2021
- Submitted: March 12, 2021
- Operation: Air carrier
- Aircraft: [N1489A](https://openairdocs.org/aircraft/N1489A), registered now
- Make and model: Boeing 767-31K
- Registry model: [Boeing 767-31K](https://openairdocs.org/model/boeing-767-31k) (OpenAirDocs)
- Aircraft serial: 27206
- Aircraft time: 109,152 hours, 21,803 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Apu
- Condition: Malfunctioned
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2021031100521

## Discrepancy

"APU FAULT" APU FAILED TO START AFTER 3 ATTEMPTS(<P>PERFORMED APU CONTROL UNIT BITE TEST REF AMM 49-61-05. TESTED NORMAL, STARTED APU NORMAL</P>)

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