# SDR UALA2012072404003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 20, 2012
- Submitted: August 10, 2012
- Operation: Air carrier
- Aircraft: [N477UA](https://openairdocs.org/aircraft/N477UA), registered now
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 1514
- Aircraft time: 36,097 hours, 15,704 cycles
- Engine: Iae V2527A5
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Controller
- Part number: 759D000002
- Part serial: 17
- Condition: Failed
- Location: Nr 1
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2012072404003

## Discrepancy

PASSING 12K, COCKPIT AIRFLOW WENT TO ZERO.  RESUMED AT FL220.  GOT VERY VERY WARM.  CREW HEARD SQUEALING NOISE JUST PRIOR TO FLOW GOING TO ZERO.  REPLACED PACK NR 1 CONTROLLER.

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