Narrative:

We were an emergency aircraft due to rudder and stabilizer trim problems. We were given clearance to FL240 diverting to ZZZ1. At approximately FL245, center advised us of traffic at our 10 O'clock position and five miles. Our attention was diverted outside the cockpit, and the autoplt was unable to level off at FL240 due to stabilizer problems that we were having. The aircraft descended to FL236, the autoplt was disconnected and hand flown back to FL240 with excessive pitch force due to the stabilizer problem. Center queried our altitude, and we reported level at FL240. At the time of query, we were back level at FL240. We did receive a TCAS TA. Flight continued without further incident. Callback conversation with reporter revealed the following information: the reporter stated this aircraft had a five month maintenance history on rudder trim malfunctions. At FL310, the reporter said the stabilizer trim failed and required heavy input to the elevators to change pitch attitude resulting in an altitude deviation. The reporter stated when on the ground, the airplane was taken out of service and the stabilizer was reset, but the rudder trim required a rudder trim motor, electrical wiring repair, and connector.

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Original NASA ASRS Text

Title: A CL65 DECLARED AN EMER AND DIVERTED DUE TO STABILIZER TRIM AND RUDDER TRIM FAILURE. ON DSCNT INCURRED ALT DEV DUE TO STABILIZER TRIM FAILURE.

Narrative: WE WERE AN EMER ACFT DUE TO RUDDER AND STABILIZER TRIM PROBS. WE WERE GIVEN CLRNC TO FL240 DIVERTING TO ZZZ1. AT APPROX FL245, CTR ADVISED US OF TFC AT OUR 10 O'CLOCK POSITION AND FIVE MILES. OUR ATTENTION WAS DIVERTED OUTSIDE THE COCKPIT, AND THE AUTOPLT WAS UNABLE TO LEVEL OFF AT FL240 DUE TO STABILIZER PROBS THAT WE WERE HAVING. THE ACFT DSNDED TO FL236, THE AUTOPLT WAS DISCONNECTED AND HAND FLOWN BACK TO FL240 WITH EXCESSIVE PITCH FORCE DUE TO THE STABILIZER PROB. CTR QUERIED OUR ALT, AND WE RPTED LEVEL AT FL240. AT THE TIME OF QUERY, WE WERE BACK LEVEL AT FL240. WE DID RECEIVE A TCAS TA. FLT CONTINUED WITHOUT FURTHER INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THIS ACFT HAD A FIVE MONTH MAINT HISTORY ON RUDDER TRIM MALFUNCTIONS. AT FL310, THE RPTR SAID THE STABILIZER TRIM FAILED AND REQUIRED HEAVY INPUT TO THE ELEVATORS TO CHANGE PITCH ATTITUDE RESULTING IN AN ALT DEVIATION. THE RPTR STATED WHEN ON THE GND, THE AIRPLANE WAS TAKEN OUT OF SVC AND THE STABILIZER WAS RESET, BUT THE RUDDER TRIM REQUIRED A RUDDER TRIM MOTOR, ELECTRICAL WIRING REPAIR, AND CONNECTOR.

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.