# SDR 99UAL900076

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 2, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N776UA](https://openairdocs.org/aircraft/N776UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26937
- Engine: Pwa PW4077
- System (JASC): [7532 · Compressor Bleed Valve](https://openairdocs.org/jasc/7532)
- Part: Solenoid
- Part number: 04P2310
- Condition: Sticking
- Location: Nr 2 Engine
- Part time: 793 hours
- Stage of operation: DE
- Nature of condition: R
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900076

## Discrepancy

NR 2 ENGINE EXPERIENCED COMPRESSOR STALL SEVERAL TIMES DURING DESCENT FROM FLIGHT LEVEL 40.5 TO 24.0.  *S/D*  SURGES, WHICH WERE RECOVERABLE, WERE ATTRIBUTED TO THE 2.9 STABILITY BLEED VALVE NOT OPENING WHEN COMMANDED.  REPLACED 2.9 BLEED CONTROL SOLENOID (P/N 04P23-10), DUE TO STICKING INTERMITTENTLY ON STABILITY SIDE.

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