# SDR 95UAL900226

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 24, 1995
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N974UA
- Make and model: Boeing 737291
- Aircraft serial: 21597
- Engine: Pwa JT8D17
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Solenoid Valve
- Part number: 1FA061014
- Condition: Inoperative
- Location: Aileron
- Stage of operation: CR
- Nature of condition: F
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/95UAL900226

## Discrepancy

AUTOPILOT AILERON CHANNEL INITIATES UNCOMMANDED BANKS IN HEADING HOLD MODE - POPS C.B.D.C.   ALSO, CAUSES A 1000 FOOT CLIMB OR DESCENT.  REPLACED B-SYSTEM AILERON SOLENOID VALVE AND PERFORMED LEAK CHECK.  ALSO, PERFORMED AUTOPILOT FUNCTION TEST, ROLL CHANNEL CAT II TEST, AND PITCH AND CONTROLLER CAT II TEST.  CHECKED O.K.

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