A crj-200 cas alerted ap trim is lwd and while complying with the QRH the aileron trim was found ino...

Narrative:

About 20 miles from our destination [an] ap trim is lwd caution message was posted. In accordance with the QRH the first officer/pilot flying disconnected the autopilot and noted that roll control was very difficult. The aileron trim was found to be not working. I was in the QRH when I heard a loud snap and the aircraft rolled to the right. The autopilot was not engaged and the first officer was able to stop the roll. We declared an emergency and headed straight to [runway] 30L. Aircraft control was a bit better after the 'snap' but still very difficult. Although control was difficult we were still flying and there would be no 'troubleshooting.' we landed safely.

Original NASA ASRS Text

Title: A CRJ-200 CAS alerted AP TRIM IS LWD and while complying with the QRH the Aileron Trim was found inoperative. Following a loud snap the aircraft rolled right but was then recovered so an emergency was declared and with a binding aileron flown to the destination.

Narrative: About 20 miles from our destination [an] AP TRIM IS LWD caution message was posted. In accordance with the QRH the First Officer/pilot flying disconnected the autopilot and noted that roll control was very difficult. The aileron trim was found to be not working. I was in the QRH when I heard a loud snap and the aircraft rolled to the right. The autopilot was not engaged and the First Officer was able to stop the roll. We declared an emergency and headed straight to [Runway] 30L. Aircraft control was a bit better after the 'snap' but still very difficult. Although control was difficult we were still flying and there would be no 'troubleshooting.' We landed safely.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1083602
Time
Date	201304
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Aileron Trim System
Person 1
Function	Pilot Not Flying Captain
Events
Anomaly	Aircraft Equipment Problem Critical Inflight Event / Encounter Loss Of Aircraft Control

A crj-200 cas alerted ap trim is lwd and while complying with the QRH the aileron trim was found inoperative. Following a loud snap the aircraft rolled right but was then recovered so an emergency was declared and with a binding aileron flown to the destination.