# SDR FDEA202609281442

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 28, 2026
- Submitted: September 28, 2026
- Operation: Air carrier
- Aircraft: [N591FE](https://openairdocs.org/aircraft/N591FE), registered now
- Make and model: Doug MD-11F
- Registry model: [Doug MD-11F](https://openairdocs.org/model/mcdonnell-douglas-md-11f) (OpenAirDocs)
- Aircraft serial: 48527
- Aircraft time: 97,296 hours, 22,285 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Solenoid Valve
- Part number: 8817001001
- Condition: Malfunctioned
- Stage of operation: CL
- How discovered: O
- Nature of condition: F
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FDEA202609281442

## Discrepancy

DURING TAKEOFF, PF NOTICED AN UNUSUAL AMOUNT OF FORCE TO ROTATE ACFT.  DURING CLIMB, HAND FLYING, APPROX 3X AMOUNT OF USUAL FORCE REQUIRED TO MOVE ACFT IN PITCH AXIS.  WHEN AP1 IN USE,  AP FUNCTIONED NORMAL.  ATTEMPT MADE TO SWITCH TO AP2, AP2 WAS NOT AVAIL.  DURING LANDING, WHEN AP DISENGAGED, EXTRA FORCE REQUIRED TO MOVE PITCH AXIS.  BELOW 500,  FELT AS IF AP MADE INPUTS CAUSING EXCESS FORCE TO OVERRIDE. AN EMERGENCY DECLARED INTO MEM.  REF TSI 27-30/1447 FOR ELEVATOR FORCE CHECKS, SYSTEM INSPECTIONS, AND LUBRICATION. REF TSI 22-10/1449 & WRI 22-10/1450 FOR OTHER MAINTENANCE PEROFRMED.  REMOVED AND REPLACED RT INBD ELEVATOR SOLENOID VALVE S2-827.

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