DHC8-100 first officer is informed by the captain during landing of jammed ailerons in the left wing...

Narrative:

I was acting as pilot monitoring on routine revenue flight. Flight proceeded uneventfully in perfect VFR weather to destination. Approach proceeded normally under manual flying without autopilot engaged until the landing flare. As the plane flared for landing the captain seemed to struggle with control yoke and made a verbal exclamation. Immediately afterwards the aircraft landed normally. During rollout as the captain transferred to the nose wheel steering tiller; he asked me to take the control yoke and try to deflect it to the left. At about 15-20 degrees of control deflection to the left; the yoke felt jammed. I tried successive and repeated movements back to the right and then back to the left. Each time the yoke felt jammed in the same spot but each time the jam felt softer. Eventually I used more force; approximately 15-20 lbs; and yoke seemed to break free. Subsequent movements of the yoke eventually caused the jam to disappear altogether. The flight arrived at the gate at which time maintenance control was advised. The aircraft was then inspected and approved for ferry. The ferry flight proceeded normally and arrived without incident.

Original NASA ASRS Text

Title: DHC8-100 First Officer is informed by the Captain during landing of jammed ailerons in the left wing down direction. The First Officer is asked to try it for himself and initially feels resistance when rolling to the left but repeated attempts result in the resistance disappearing.

Narrative: I was acting as pilot monitoring on routine revenue flight. Flight proceeded uneventfully in perfect VFR weather to destination. Approach proceeded normally under manual flying without autopilot engaged until the landing flare. As the plane flared for landing the Captain seemed to struggle with control yoke and made a verbal exclamation. Immediately afterwards the aircraft landed normally. During rollout as the Captain transferred to the nose wheel steering tiller; he asked me to take the control yoke and try to deflect it to the left. At about 15-20 degrees of control deflection to the left; the yoke felt jammed. I tried successive and repeated movements back to the right and then back to the left. Each time the yoke felt jammed in the same spot but each time the jam felt softer. Eventually I used more force; approximately 15-20 lbs; and yoke seemed to break free. Subsequent movements of the yoke eventually caused the jam to disappear altogether. The flight arrived at the gate at which time Maintenance Control was advised. The aircraft was then inspected and approved for ferry. The ferry flight proceeded normally and arrived without incident.

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	1090667
Time
Date	201305
Local Time Of Day	0601-1200
Place
Locale Reference	PHL.Airport
State Reference	PA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Dash 8-100
Operating Under FAR Part	Part 121
Flight Phase	Landing
Flight Plan	IFR
Component
Aircraft Component	Aileron Control System
Person 1
Function	First Officer Pilot Not Flying
Events
Anomaly	Aircraft Equipment Problem Critical

DHC8-100 first officer is informed by the captain during landing of jammed ailerons in the left wing down direction. The first officer is asked to try it for himself and initially feels resistance when rolling to the left but repeated attempts result in the resistance disappearing.