# SDR FDEA201201130142

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 13, 2012
- Submitted: January 17, 2012
- Operation: Air carrier
- Aircraft: N479FE
- Make and model: Boeing 727227
- Aircraft serial: 21461
- Aircraft time: 45,472 hours, 29,677 cycles
- System (JASC): [2730 · Elevator Control System](https://openairdocs.org/jasc/2730)
- Part: Sensor
- Part number: 2588838
- Part serial: 1255238
- Condition: Failed
- Location: Elevator
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FDEA201201130142

## Discrepancy

DURING CRUISE FLIGHT WITH AUTOPILOT ELEVATOR SERVO  "A" ENGAGED, ACFT HAD PITCH OSCILLATIONS GREATER THAN PLUS/MINUS 2  DEGREES INTERMITTENTLY.  OSCILLATIONS SEEMED MORE PRONOUNCED DURING TURBULENCE OR WHEN ELEVATOR WAS LOADED IN A TURN.  A/P SERVO INDICATOR SHOWED DEFLECTIONS MATCHING THE OSCILLATIONS ONLY ON THE RT ELEVATOR WITH  DEFLECTIONS OF PLUS/MINUS .2500 IN.  PREFORMED ELEVATOR POSITION AND TRIM SENSOR WIRING AND LINKAGE INSPECTION CHECK,FOUND LT POSITION SENSOR SHORTED.   R & R SENSOR IAW AMM 22-11-071-4.

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