# SDR AALA20120724018

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 24, 2012
- Submitted: July 26, 2012
- Operation: Air carrier
- Aircraft: N477AA
- Make and model: Doug DC-9-82
- Registry model: [Doug DC-9-82](https://openairdocs.org/model/mcdonnell-douglas-dc-9-82) (OpenAirDocs)
- Aircraft serial: 49652
- Aircraft time: 68,334 hours, 35,866 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: O-Ring
- Condition: Damaged
- Location: Apu
- Stage of operation: CL
- How discovered: O
- Nature of condition: K, B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20120724018

## Discrepancy

SMF - CREW REPORTED SMOKE IN COCKPIT AND THEN CABIN.  EMERGENCY DECLARED FLIGHT RETURNED SMF LANDED WITHOUT INCIDENT.  AIRCRAFT REMOVED FROM SERVICE.  FOUND AUXILIARY POWER UNIT OIL COOLER LINE LEAKING.  REPLACED O-RING ON THE APU OIL COOLER.  SYSTEM GROUND CHECK NORMAL OPERATION.

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