# SDR AALA2018092219019

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 18, 2018
- Submitted: September 22, 2018
- Operation: Air carrier
- Aircraft: [N970TW](https://openairdocs.org/aircraft/N970TW), registered now
- Make and model: Doug MD 83
- Registry model: [Doug MD 83](https://openairdocs.org/model/mcdonnell-douglas-md-83) (OpenAirDocs)
- Aircraft serial: 53620
- Aircraft time: 51,383 hours, 25,799 cycles
- System (JASC): [2170 · Humidity Control System](https://openairdocs.org/jasc/2170)
- Part: Coalescer Bag
- Part number: AAP3090A
- Part serial: 108545
- Condition: Defective
- Location: A/C Pack
- Stage of operation: TO
- How discovered: O
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA2018092219019

## Discrepancy

ODOR OF DIRTY SOCKS IN THE CABIN, DISSIPATED WITHOUT FLIGHT OR CABIN CREW ACTIONS.  OCCURED FROM TAKEOFF ROLL THROUGH 7000 FT.  ACCOMPLISHED MCM 05-96-70. ODOR DETERMINED TO BE TYPE 4 ODOR.  THE AIRCRAFT WAS GROUNDED.   REPLACED THE LEFT AND RIGHT AIR CONDITIONER PRESSURE REGULATOR VALVES IAW MM 21-31-01,  AND THE LEFT AND RIGHT COALESCER BAGS IAW MM 21-20-02. OPS AND LEAK CHECKED GOOD.

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