# SDR UIEA2021052101162

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 21, 2021
- Submitted: May 21, 2021
- Operation: Air carrier
- Aircraft: [N640GT](https://openairdocs.org/aircraft/N640GT), registered now
- Make and model: Boeing 767-3S1
- Registry model: [Boeing 767-3S1](https://openairdocs.org/model/boeing-767-3s1) (OpenAirDocs)
- Aircraft serial: 25221
- Aircraft time: 93,139 hours, 19,850 cycles
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Apu
- Condition: Unknown
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2021052101162

## Discrepancy

"APU FAULT" APU WON'T START ON GROUND, HUNG START AT 17%.(<P>TROUBLESHOT APU START FAULT. APU FAULTED @ 7% START. FAULT CLEARED, APU STARTED NORMAL. BATTERY START. APU BATT VOLTAGE 28VDC DIPPED TO 24 VDC. BATT REGAINED 28VDC @ 13 AMPS</P>)

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