A canadair cl-65 on climb out to FL240 diverted due to stabilizer trim caution, mach trim caution and autoplt trim caution. Caused by failed horizontal stabilizer trim control unit.

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Attributes
ACN	548556
Time
Date	200205
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : iah.airport
State Reference	TX
Altitude	msl single value : 24000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zhu.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 18000 flight time type : 2400
ASRS Report	548556
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : eicas pitch trim warning other flight crewa other flight crewb
Resolutory Action	aircraft : automation overrode flight crew flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On climb out northwest of iah,. We got a 'stabilizer trim' caution annunciator and 'mach trim' caution annunciator. I was PF and I had my first officer turn on the autoplt at that point. Approximately 1-2 mins after turning on the autoplt, we got an 'autoplt trim' caution. The aircraft did not have any imminent control problems that we were experiencing (ie. We had no problems controling the aircraft), however, in the interest of safety, I elected to turn around back to iah and land as a precaution. We followed all procedures and talked with air carrier and maintenance about this problem. Callback conversation with reporter revealed the following information: the reporter stated all of the stabilizer trim functions operated normally but the EICAS caution warnings were annunciated and could not be ignored. The reporter said the horizontal stabilizer trim control unit was found to be the problem. The reporter stated the unit was replaced and systems and systems warning operated ok.

Original NASA ASRS Text

Title: A CANADAIR CL-65 ON CLBOUT TO FL240 DIVERTED DUE TO STABILIZER TRIM CAUTION, MACH TRIM CAUTION AND AUTOPLT TRIM CAUTION. CAUSED BY FAILED HORIZONTAL STABILIZER TRIM CTL UNIT.

Narrative: ON CLBOUT NW OF IAH,. WE GOT A 'STAB TRIM' CAUTION ANNUNCIATOR AND 'MACH TRIM' CAUTION ANNUNCIATOR. I WAS PF AND I HAD MY FO TURN ON THE AUTOPLT AT THAT POINT. APPROX 1-2 MINS AFTER TURNING ON THE AUTOPLT, WE GOT AN 'AUTOPLT TRIM' CAUTION. THE ACFT DID NOT HAVE ANY IMMINENT CTL PROBS THAT WE WERE EXPERIENCING (IE. WE HAD NO PROBS CTLING THE ACFT), HOWEVER, IN THE INTEREST OF SAFETY, I ELECTED TO TURN AROUND BACK TO IAH AND LAND AS A PRECAUTION. WE FOLLOWED ALL PROCEDURES AND TALKED WITH ACR AND MAINT ABOUT THIS PROB. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED ALL OF THE STABILIZER TRIM FUNCTIONS OPERATED NORMALLY BUT THE EICAS CAUTION WARNINGS WERE ANNUNCIATED AND COULD NOT BE IGNORED. THE RPTR SAID THE HORIZONTAL STABILIZER TRIM CTL UNIT WAS FOUND TO BE THE PROB. THE RPTR STATED THE UNIT WAS REPLACED AND SYSTEMS AND SYSTEMS WARNING OPERATED OK.

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.