EMB ERJ 135 ER/LR
Flight Crew Air Transport Pilot (ATP)
ATC Issue All Types; Inflight Event / Encounter Weather / Turbulence; Inflight Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Unstabilized Approach
Flight Crew Regained Aircraft Control
Procedure; Airport; Aircraft
We were landing at JFK on runway 31R.  They were departing runway 22R shortened (at taxi way F I believe).  It was a smooth approach to landing with a 12kt cross wind.  As I was in the middle of my flare (probably 3 or 4 feet above the runway) we were all of a sudden thrown to the right and rolled to the right.  I managed to keep the wing from striking the ground and we landed half way between the center line and the edge of the runway.  There was no time/way to execute a missed approach.  We landed first with the right side landing gear then the left and the nose.  I wasn't paying close attention but I remember there being a large aircraft either lined up on 22R or going into position and hold as we were landing.  I believe that aircraft powered up and its Jet Blast is what struck us.  I don't know if it was in position powering up for departure of it powered up to make the turn into position and hold. In my opinion it did not feel like wake turbulence of the preceding aircraft based on my experience in wake turbulence and the lack of any 'turbulence' associated with the event.  There was also a good crosswind and the aircraft ahead of us landed 4 miles ahead and was no larger then an A320.  We ended up OK; but it could have been a very dangerous situation.The Aircraft going into position and hold could have maintained idle thrust either in position or while turning into position
An EMB-135 Captain; in the landing flare for runway 31R at JFK; believes his aircraft was buffeted by the jet blast of an aircraft cleared for an intersection takeoff from runway 22R.  The reporter was able to recover from the upset and land safely in a left crosswind although touching down first on the downwind right main landing gear.