# SDR AALA200803072

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 9, 2008
- Submitted: February 12, 2009
- Operation: Air carrier
- Aircraft: [N7509](https://openairdocs.org/aircraft/N7509), registered now
- 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: 49803
- Aircraft time: 56,326 hours
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: A/C Pack
- Condition: Frozen
- Location: Zone 100
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA200803072

## Discrepancy

MSY INFLIGHT - CREW REPORTED AT FL340 FLOW ON BOTH AIR CONDITIONING PACKS REDUCED TO ZERO FLOW FOLLOWED BY CABIN PRESSURE CLIMB.  FLOW CAME BACK TO NORMAL WHEN DESCENDING THROUGH LOW TEENS.  LANDED MSY WITHOUT INCIDENT.  NO FAULTS FOUND.  SUSPECT BOTH PACKS FROZEN WITH MOISTURE.  REPLACED BOTH PACK COALESCER BAGS.  SYSTEM GROUND CHECKED NORMAL OPERATION.

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