# SDR 2007UALA01461

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 10, 2007
- Submitted: May 16, 2007
- Operation: Air carrier
- Aircraft: N421UA
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 500
- Aircraft time: 43,955 hours, 15,660 cycles
- Engine: Iae V2527A5
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: A/C Pack
- Condition: Failed
- Location: Nr 2
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2007UALA01461

## Discrepancy

RTFL DUE TO NR 2 PACK FAILURE & NR 1 PACK'S CURRENT DEFERRAL.   AFTER ATB, ON GROUND TESTING INDICATING NORMAL SINGLE PACK OPS-PERFORMED PACK TEMP CONTROL TEST- OK, REPLACED TURBINE BYPASS VALVE - ALL OPS TESTS ARE NORMAL- NO REPEATS SINCE ORIGINAL.

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