# SDR UALA2012082704803

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 26, 2012
- Submitted: August 30, 2012
- Operation: Air carrier
- Aircraft: [N171UA](https://openairdocs.org/aircraft/N171UA), registered now
- Make and model: Boeing 747422
- Aircraft serial: 24322
- Aircraft time: 86,824 hours, 10,281 cycles
- Engine: Pwa PW4056
- System (JASC): [3040 · Windshield/Door Rain/Ice Removal](https://openairdocs.org/jasc/3040)
- Part: Circuit Breaker
- Condition: Faulty
- Location: Cockpit
- Stage of operation: IN
- How discovered: C
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2012082704803

## Discrepancy

CAPT'S WINDSHIELD AIR FAILED.  CREW COMMENTS:  AT FL330. FOUND BOTH CAPT & F/O WINDSHIELD DEFOG VALVES FAILED CLOSED.  MANUALLY OPENED BOTH VALVES PER MEL REQUIREMENTS, AIRFLOW NOTED ON BOTH CAPTS & F/O'S WINDOWS.  REPLACED CIRCUIT BREAKER C10291 ON THE P180 PANEL, OPS CHECK GOOD PER AMM.

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