A CL65 flight crew during takeoff roll; received a configuration aileron master warning. Takeoff abo...

Attributes
ACN	757251
Time
Date	200710
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 6200 flight time type : 4000
ASRS Report	757251
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : eicas-master warning
Resolutory Action	flight crew : rejected takeoff
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

During takeoff roll we received a confign aileron master warning. Prior to takeoff we performed the before takeoff checklist and we verified that all trims were configured for takeoff at green. According to my copilot after we aborted; he saw the aileron trim move to the left on its own. The aborted takeoff was performed safely and according to the checklist. We talked to our dispatcher and agreed to return to the gate for maintenance. All passenger and crew were ok to continue to destination without further incident. Callback conversation with reporter revealed the following information: reporter stated this is an electric aileron trim with dual switches on the center pedestal. This was a configuration 1 on the EICAS display. He hasn't heard of any problems with the trim switches previous to this incident. Reporter also stated the cl-65 does have a problem with air loads reducing the aileron trim inputs in flight. The reporter believes bombardier and FAA are working to address this issue. The cause of the uncommanded aileron trim input is unknown at this time.

Original NASA ASRS Text

Title: A CL65 FLIGHT CREW DURING TKOF ROLL; RECEIVED A CONFIGURATION AILERON MASTER WARNING. TKOF ABORTED. AILERON TRIM WAS NOTICED MOVING TO THE LEFT ON ITS OWN.

Narrative: DURING TKOF ROLL WE RECEIVED A CONFIGN AILERON MASTER WARNING. PRIOR TO TKOF WE PERFORMED THE BEFORE TKOF CHKLIST AND WE VERIFIED THAT ALL TRIMS WERE CONFIGURED FOR TKOF AT GREEN. ACCORDING TO MY COPLT AFTER WE ABORTED; HE SAW THE AILERON TRIM MOVE TO THE L ON ITS OWN. THE ABORTED TKOF WAS PERFORMED SAFELY AND ACCORDING TO THE CHKLIST. WE TALKED TO OUR DISPATCHER AND AGREED TO RETURN TO THE GATE FOR MAINT. ALL PAX AND CREW WERE OK TO CONTINUE TO DEST WITHOUT FURTHER INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THIS IS AN ELECTRIC AILERON TRIM WITH DUAL SWITCHES ON THE CENTER PEDESTAL. THIS WAS A CONFIGURATION 1 ON THE EICAS DISPLAY. HE HASN'T HEARD OF ANY PROBLEMS WITH THE TRIM SWITCHES PREVIOUS TO THIS INCIDENT. REPORTER ALSO STATED THE CL-65 DOES HAVE A PROBLEM WITH AIR LOADS REDUCING THE AILERON TRIM INPUTS IN FLIGHT. THE RPTR BELIEVES BOMBARDIER AND FAA ARE WORKING TO ADDRESS THIS ISSUE. THE CAUSE OF THE UNCOMMANDED AILERON TRIM INPUT IS UNKNOWN AT THIS TIME.

Data retrieved from NASA's ASRS site as of January 2009 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.

A CL65 flight crew during takeoff roll; received a configuration aileron master warning. Takeoff aborted. Aileron trim was noticed moving to the left on its own.