# SDR TWAA0015303

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 2, 2000
- Submitted: October 4, 2000
- Operation: Air carrier
- Aircraft: [N9628W](https://openairdocs.org/aircraft/N9628W), registered now
- Make and model: Doug DC-9-83
- Registry model: [Doug DC-9-83](https://openairdocs.org/model/douglas-dc-9-83) (OpenAirDocs)
- Aircraft serial: 53598
- Aircraft time: 5,412 hours, 2,629 cycles
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Apu
- Condition: Overserviced
- Location: Aft
- Stage of operation: DE
- How discovered: V
- Nature of condition: W, B
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/TWAA0015303

## Discrepancy

IN DESCENT SMOKE APPEARED IN COCKPIT AND CABIN.  TURNED OFF ANTI-ICE SWITCHES AND SMOKE DISAPPEARED.  FOUND OIL RESIDUE IN DUCTS APPARENTLY CAUSED BY APU OIL BEING OVERSERVICED.  CHANGED ANTI-ICE PRESSURE REGULATING VALVE WHICH APPARENTLY FAILED AND SMOKE TO APPEAR.  CHECK-C 12-14-99 STL.

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