Narrative:

The event occurred on a part 91 flight to ZZZ. The event aircraft was a learjet 31A. Enroute altitude was FL400. Descent was initiated 90 NM from zzzzz intersection; the initial approach fix for the RNAV (GPS) runway xx approach to ZZZ. Descending through FL180 I turned on the nacelle heaters; but did not turn on the wing and stab heat; as I anticipated a short descent through a shallow cloud layer to above freezing temperatures. The approach proceeded normally; with the aircraft in the landing configuration and the before landing checklist completed prior to glide path intercept. The aircraft entered the cloud tops at approximately 1500 MSL and exited the bases at approximately 900 MSL. There were no indications of ice accumulation on the normal reference area during descent. During the landing flare (less than 10 ft AGL); as the flying pilot applied right aileron to counteract the right crosswind; the left wing abruptly dropped. I immediately took the controls; applying full right aileron as the left main landing gear contacted the runway; followed closely by deployment of spoilers; thrust reversers and brakes to return the aircraft to the runway centerline.upon exiting the aircraft; I observed a small amount (less than 1/4 inch) of rough; rapidly melting ice on the leading edges of the wings. Inspection revealed that the trailing edge of the left wingtip had contacted the runway surface; causing abrasion to the contact area. I believe the combination of the small amount of ice; aileron deflection and mechanical turbulence from buildings on the upwind side of the runway caused the left wing to stall at a higher than normal airspeed; resulting in the uncommanded left roll. Contributing factors include my failure to turn on the wing and stab heat prior to entering the cloud layer.

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Original NASA ASRS Text

Title: Lear 31A Captain reported a wingtip strike occurred on landing when roll authority was compromised in the landing flare perhaps from ice accumulation on the wing.

Narrative: The event occurred on a Part 91 flight to ZZZ. The event aircraft was a Learjet 31A. Enroute altitude was FL400. Descent was initiated 90 NM from ZZZZZ intersection; the initial approach fix for the RNAV (GPS) RWY XX approach to ZZZ. Descending through FL180 I turned on the nacelle heaters; but did not turn on the wing and stab heat; as I anticipated a short descent through a shallow cloud layer to above freezing temperatures. The approach proceeded normally; with the aircraft in the landing configuration and the before landing checklist completed prior to glide path intercept. The aircraft entered the cloud tops at approximately 1500 MSL and exited the bases at approximately 900 MSL. There were no indications of ice accumulation on the normal reference area during descent. During the landing flare (less than 10 ft AGL); as the flying pilot applied right aileron to counteract the right crosswind; the left wing abruptly dropped. I immediately took the controls; applying full right aileron as the left main landing gear contacted the runway; followed closely by deployment of spoilers; thrust reversers and brakes to return the aircraft to the runway centerline.Upon exiting the aircraft; I observed a small amount (less than 1/4 inch) of rough; rapidly melting ice on the leading edges of the wings. Inspection revealed that the trailing edge of the left wingtip had contacted the runway surface; causing abrasion to the contact area. I believe the combination of the small amount of ice; aileron deflection and mechanical turbulence from buildings on the upwind side of the runway caused the left wing to stall at a higher than normal airspeed; resulting in the uncommanded left roll. Contributing factors include my failure to turn on the wing and stab heat prior to entering the cloud layer.

Data retrieved from NASA's ASRS site 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.