# SDR AALA20021778

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 9, 2002
- Submitted: March 28, 2003
- Operation: Air carrier
- Aircraft: [N274AA](https://openairdocs.org/aircraft/N274AA), 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: 49271
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Control Valve
- Part number: 97968011
- Condition: Failed
- Location: Acm Bay
- Stage of operation: DE
- How discovered: O
- Nature of condition: J
- Precautionary procedure: G
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20021778

## Discrepancy

EN ROUTE PDX-ORD, DURING CRUISE, CABIN GOT VERY COLD.  BOTH PACK PRESSURES OK.  CABIN STARTED CLIMBING, INITIATED EMERGENCY DESCENT.  CABIN MASKS DEPLOYED AND SPENT.  PACK PRESSURE INDICATED ZERO IN DESCENT.  BELOW 10,000 FEET PACKS REINSTATED.  LANDED ORD WITHOUT INCIDENT.  REPLACED LEFT AND RIGHT WATER SEPARATOR TEMPERATURE CONTROL VALVES.  SYSTEM GROUND CHECKED NORMAL OPERATION.  (M)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.