# SDR 2000UALA00089

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 19, 2000
- Submitted: October 4, 2000
- Operation: Air carrier
- Aircraft: [N777UA](https://openairdocs.org/aircraft/N777UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26916
- Aircraft time: 20,043 hours, 4,137 cycles
- Engine: Pwa PW4077
- System (JASC): [7500 · Engine Bleed Air System](https://openairdocs.org/jasc/7500)
- Part: Controller
- Condition: Malfunctioned
- Location: Lt Engine Fan
- Stage of operation: CR
- How discovered: O
- Nature of condition: R, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2000UALA00089

## Discrepancy

EN ROUTE GRU-MIA, EXPERIENCED LEFT ENGINE BLEED VALVE FLUCTUATIONS.  *S/D*  CAUSE WAS DETERMINED TO BE A FAULTY HIGH PRESSURE FAN AIR VALVE CONTROLLER (HPFAC), P/N: 3399100-11, LEAKING CONTROL AIR DURING HP OPENING (TOP OF DESCENT).

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