# SDR AALA20160505004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 26, 2016
- Submitted: May 5, 2016
- Operation: Air carrier
- Aircraft: N439AA
- Make and model: Doug DC-9-83
- Registry model: [Doug DC-9-83](https://openairdocs.org/model/douglas-dc-9-83) (OpenAirDocs)
- Aircraft serial: 49457
- Aircraft time: 874,375 hours, 417,678 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Pressure Switch
- Part number: 38761864
- Part serial: 010922702013
- Condition: Leaking
- Location: Apu
- Stage of operation: TX
- How discovered: O
- Nature of condition: K, B
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20160505004

## Discrepancy

AIRCRAFT WAS GNDED.  DURING BOARDING THE CABIN BEGAN TO FILL WITH SMOKE.  APU AIR WAS TURNED OFF.  FOUND THE APU LOW OIL PRESS SWITCH LEAKING.  R & R SWITCH & ACCOMPLISHED LEAK CHECK IAW AMM 49-90-03.  SYS CHECKED NORMAL.

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