# SDR 2000UALA00602

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 19, 2000
- Submitted: December 12, 2000
- Operation: Air carrier
- Aircraft: [N778UA](https://openairdocs.org/aircraft/N778UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26940
- Aircraft time: 18,487 hours
- Engine: Pwa PW4077
- Engine time: 17,891 hours, 3,515 cycles
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Check Valve
- Part number: 32026182
- Part serial: 405
- Condition: Stuck
- Location: Nr 1 Engine
- Component: Engine, Pwa, PW4077
- Stage of operation: CR
- How discovered: O
- Nature of condition: A, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2000UALA00602

## Discrepancy

NR 1 ENGINE IFSD AT FL300.  ENGINE STALL REPORTED WITH SURGING.  FLAMES OBSERVED BY FA''S FROM FRONT AND REAR OF ENGINE.  DIVERTED BOS.  *S/D*  ENGINE WAS REMOVED.  FOUND AND REPLACED FAILED INTERMEDIATE PRESSURE CHECK VALVE IN PNEUMATIC SYSTEM LOCATED AT 11 O''CLOCK ON 8TH STAGE DUCT OF ENGINE HIGH PRESSURE COMPRESSOR.  THE CHECK VALVE WAS STUCK IN THE OPEN POSITION.

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