# SDR 2006F00034

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 28, 2006
- Submitted: August 28, 2006
- Operation: Air carrier
- Aircraft: N464AT
- Make and model: Boeing 737-2L9
- Registry model: [Boeing 737-2L9](https://openairdocs.org/model/boeing-737-2l9) (OpenAirDocs)
- Aircraft serial: 21278
- Engine: Pwa JT8D15
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: A/C Pack
- Part number: 39606411
- Condition: Failed
- Location: A/C Bay
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: B, G
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2006F00034

## Discrepancy

AIRCRAFT N464AT DEPARTED EWN FOR ISO WITH THE LEFT HAND AIR CONDITIONING PACK AIRFLOW SHUTOFF VALVE ON DMI (MEL 21-02) AND FLYING UNDER PACK PRESSURIZED OPERATIONS PROCEDURE.  EN ROUTE TO ISO AT A FL OF 22,000 FEET THE FLIGHT CREW NOTICED THE RIGHT HAND AIR CONDITIONING PACK WAS HAVING DIFFICULTY MAINTAINING CABIN PRESSURE.  THE FLIGHT CREW DECIDED TO DESCEND TO A LOWER ALTITUDE, AT APPROXIMATELY 16,000 FEET THE RIGHT HAND AIR CONDITIONING PACK TRIPPED THE C/B AND CAUSED THE PSU OXYGEN MASK TO DROP.  FLIGHT WAS DIVERTED TO GSO.

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