Narrative:

We were on final to runway 16L at seattle in night VFR conditions. There was a left crosswind component; and as we crossed the threshold; our landing lights illuminated a large; 4 engine cargo plane on an adjacent taxiway (taxiway B). There was no apparent motion and neither the first officer nor myself noted any exterior lights on the aircraft. The aircraft was parked perpendicular to the runway; facing the cargo ramp. Moments after retarding thrust and beginning the flare we flew through its jet blast. We were de-crabbed and left wing low for the crosswind when the jet blast forced an uncontrollable roll to the left and the left main gear to violently impact the runway. This was followed immediately by an uncontrollable roll to the right; whereby the left wing and gear lifted and slammed the right gear into the runway full opposite stick deflection had no effect. Finally; the left gear settled back down and we were through the jet blast; although well right of the runway centerline. After parking; I inspected both engines and wingtips for damage; we were not sure the extent of the rolls; but thought that either of them might have been enough to drag a pod. There was no damage noted; but a ground crew member noted that there was an access panel hanging open upon gate arrival the first officer called the tower while I was downstairs. The tower controller apologized for not warning us and said they were holding their breath as it looked like a wild ride from the cab. Apparently; the antonov 124 cargo plane was given permission to taxi sometime while we were on short final; and it was powering up just as we flew directly behind it.

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Original NASA ASRS Text

Title: A320 Captain reports violent reaction during landing flare to jet blast from AN124 with tail to the landing zone and just powering up. Aileron control has little effect and aircraft slams down hard first on the left then on the right main gear. No apparent damage is reported.

Narrative: We were on final to Runway 16L at Seattle in night VFR conditions. There was a left crosswind component; and as we crossed the threshold; our landing lights illuminated a large; 4 engine cargo plane on an adjacent taxiway (Taxiway B). There was no apparent motion and neither the First Officer nor myself noted any exterior lights on the aircraft. The aircraft was parked perpendicular to the runway; facing the cargo ramp. Moments after retarding thrust and beginning the flare we flew through its jet blast. We were de-crabbed and left wing low for the crosswind when the jet blast forced an uncontrollable roll to the left and the left main gear to violently impact the runway. This was followed immediately by an uncontrollable roll to the right; whereby the left wing and gear lifted and slammed the right gear into the runway full opposite stick deflection had no effect. Finally; the left gear settled back down and we were through the jet blast; although well right of the runway centerline. After parking; I inspected both engines and wingtips for damage; we were not sure the extent of the rolls; but thought that either of them might have been enough to drag a pod. There was no damage noted; but a Ground Crew member noted that there was an access panel hanging open upon gate arrival the First Officer called the Tower while I was downstairs. The Tower Controller apologized for not warning us and said they were holding their breath as it looked like a wild ride from the cab. Apparently; the Antonov 124 cargo plane was given permission to taxi sometime while we were on short final; and it was powering up just as we flew directly behind it.

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.