Dash8 flight crew experiences aileron mistrim during takeoff roll and rejects the takeoff. Aileron t...

Attributes
ACN	861928
Time
Date	200911
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Dash 8-300
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Component
Aircraft Component	Aileron Trim System
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

At the trim item on the checklist; I observed that the aileron trim indicator was showing an almost full right wing down indication. I centered the needle and we continued the checklist. As we began our takeoff roll I thought at first the ailerons were stiff - but as we went through 40 KTS they started to roll left. At 60 KTS there was no doubt that there was a problem so I retarded the throttles and rejected the takeoff. Max speed that the first officer observed was 80 KTS. After exiting the runway I looked down at the aileron indicator and it was almost full left wing down. I once again tried to center the needle - this time the needle jumped around erratically. We taxied back to the gate and called maintenance.

Original NASA ASRS Text

Title: Dash8 Flight Crew experiences aileron mistrim during takeoff roll and rejects the takeoff. Aileron trim indication is found to be erratic and Crew returns to gate for maintenance.

Narrative: At the TRIM item on the checklist; I observed that the aileron trim indicator was showing an almost full Right Wing Down indication. I centered the needle and we continued the checklist. As we began our takeoff roll I thought at first the ailerons were stiff - but as we went through 40 KTS they started to roll LEFT. At 60 KTS there was no doubt that there was a problem so I retarded the throttles and rejected the takeoff. Max speed that the First Officer observed was 80 KTS. After exiting the runway I looked down at the aileron indicator and it was almost full LEFT WING DOWN. I once again tried to center the needle - this time the needle jumped around erratically. We taxied back to the gate and called Maintenance.

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.

Dash8 flight crew experiences aileron mistrim during takeoff roll and rejects the takeoff. Aileron trim indication is found to be erratic and crew returns to gate for maintenance.