# SDR AALA20100225MCI01

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 25, 2010
- Submitted: November 24, 2010
- Operation: Air carrier
- Aircraft: N70524
- 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: 49916
- Aircraft time: 57,404 hours, 29,579 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Apu
- Condition: Contaminated
- Location: Zone 100
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20100225MCI01

## Discrepancy

MCI - FLIGHT ATTENDANT REPORTED ON CLIMBOUT WHOOSHING AT AIR/CYCLING VALVE APPROXIMATELY EVERY 15 SECONDS AT SAME TIME STRONG FUMES AND SMOKE IN CABIN AND COCKPIT.  APU WAS SHUTDOWN AND SMOKE INITIALLY CLEARED BUT STARTED BACK UP AGAIN AFTER 1 MINUTE.  EMERGENCY DECLARED RETURNED MCI LANDED WITHOUT INCIDENT.  AIRCRAFT REMOVED FROM SERVICE.  ACCOMPLISHED AUXILIARY POWER UNIT INLET DOOR WASH CARD 49-97-12 AND APU WASH PROCEDURE 49-97-11.  ACCOMPLISHED PACK BURNOUT PER CARD 21-92-12.  SYSTEM GROUND CHECK NORMAL OPERATION.

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