Narrative:

While executing the BG3 departure off cvg (yrk transition), the first officer (who was the PF) asked for heading mode and autoplt on. The captain proceeded with his request as the aircraft captured 8000 ft and began a leveloff. We then received autoplt trim nd, 'east', and autoplt pitch trim caution messages. The first officer flew the plane and got the radios while the captain referenced the QRH procedures and executed them. Upon completion, the caution messages returned. The captain called cvg maintenance after it was discovered that with stabilizer trim armed #1 and #2 still engaged, nose down stabilizer trim was inoperative. After explaining the situation, the captain and cvg maintenance concluded that the flight should be brought back to cvg as a precautionary measure. The captain called the flight attendant to explain the diversion and have her discontinue service and prepare the cabin for a descent and landing in cvg. The captain made a PA to brief the passenger of the event and explain that it was merely a precautionary landing and that they could expect a normal descent and landing. Callback conversation with reporter revealed the following information: the reporter stated on returning we were switched to another aircraft and were not advised of the cause of the stabilizer trim failure.

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Original NASA ASRS Text

Title: A CANADAIR CL65 IN CLB BTWN 8000 FT TO FL210 DIVERTED DUE TO LOSS OF STABILIZER NOSE DOWN MANUAL AND AUTOPLT TRIM. CAUSE UNKNOWN.

Narrative: WHILE EXECUTING THE BG3 DEP OFF CVG (YRK TRANSITION), THE FO (WHO WAS THE PF) ASKED FOR HDG MODE AND AUTOPLT ON. THE CAPT PROCEEDED WITH HIS REQUEST AS THE ACFT CAPTURED 8000 FT AND BEGAN A LEVELOFF. WE THEN RECEIVED AUTOPLT TRIM ND, 'E', AND AUTOPLT PITCH TRIM CAUTION MESSAGES. THE FO FLEW THE PLANE AND GOT THE RADIOS WHILE THE CAPT REFED THE QRH PROCS AND EXECUTED THEM. UPON COMPLETION, THE CAUTION MESSAGES RETURNED. THE CAPT CALLED CVG MAINT AFTER IT WAS DISCOVERED THAT WITH STABILIZER TRIM ARMED #1 AND #2 STILL ENGAGED, NOSE DOWN STABILIZER TRIM WAS INOP. AFTER EXPLAINING THE SIT, THE CAPT AND CVG MAINT CONCLUDED THAT THE FLT SHOULD BE BROUGHT BACK TO CVG AS A PRECAUTIONARY MEASURE. THE CAPT CALLED THE FLT ATTENDANT TO EXPLAIN THE DIVERSION AND HAVE HER DISCONTINUE SVC AND PREPARE THE CABIN FOR A DSCNT AND LNDG IN CVG. THE CAPT MADE A PA TO BRIEF THE PAX OF THE EVENT AND EXPLAIN THAT IT WAS MERELY A PRECAUTIONARY LNDG AND THAT THEY COULD EXPECT A NORMAL DSCNT AND LNDG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED ON RETURNING WE WERE SWITCHED TO ANOTHER ACFT AND WERE NOT ADVISED OF THE CAUSE OF THE STABILIZER TRIM FAILURE.

Data retrieved from NASA's ASRS site as of July 2007 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.