# SDR 2007UALA01418

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 5, 2007
- Submitted: May 16, 2007
- Operation: Air carrier
- Aircraft: [N117UA](https://openairdocs.org/aircraft/N117UA), registered now
- Make and model: Boeing 747422
- Aircraft serial: 28810
- Aircraft time: 33,051 hours, 4,241 cycles
- Engine: Pwa PW4056
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Condition: Faulty
- Location: Apu Bay
- Stage of operation: IN
- How discovered: 9
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2007UALA01418

## Discrepancy

APU AUTO SHUTDOWN & FILLED ENTIRE CABIN WITH SMOKE.  ALSO, SAW SMOKE COMING OUT OF TAILPIPE.  [SUP 06-01-07]  REPLACED APU.  RESTARTED APU NORMALLY, INDICATIONS NORMAL. OPERATED PACKS AND NO FURTHER SMOKE OR ASSOCIATED OIL SMELL IN CABIN. A/C RETURNED TO SERVICE.

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