Narrative:

Autopilot pitch control was acting erratically. We turned autopilot off and tried control with the right side computer. There was no change. When we attempted to turn off autopilot to hand fly; the trim wheel stuck in the full forward position. We were able to over-ride and hold force against trim wheel until reaching a lower altitude on approach into our divert airport. We were able to land without further complication.

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Original NASA ASRS Text

Title: An HS125 flight crew encountered a jammed stabilizer trim system. Overcame out of trim condition with manual elevator inputs and landed without incident.

Narrative: Autopilot pitch control was acting erratically. We turned autopilot off and tried control with the right side computer. There was no change. When we attempted to turn off autopilot to hand fly; the trim wheel stuck in the full forward position. We were able to over-ride and hold force against trim wheel until reaching a lower altitude on approach into our divert airport. We were able to land without further complication.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.