# SDR AALA2009061000007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 10, 2009
- Submitted: July 1, 2009
- Operation: Air carrier
- Aircraft: N7517A
- 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: 49894
- Aircraft time: 56,955 hours, 29,162 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Relay
- Condition: Open
- Location: Thermostat
- Stage of operation: DE
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA2009061000007

## Discrepancy

SPS - INFLIGHT COS-DFW.  WHILE DESCENDING FLIGHT LOST BOTH A/C PACKS.  EMERGENCY DECLARED, LANDED SPS WITHOUT INCIDENT.  AIRCRAFT REMOVED FROM SERVICE.  FOUND OPEN COIL ON RELAY R2-279.  REPLACED AIR CONDITIONING THERMOSTAT RELAY R2-279.  REPLACED BOTH COALESCER BAGS IN WATER SEPARATOR.  SYSTEM GROUND CHECK NORMAL OPERATION.

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