Narrative:

The captain was pilot flying and landing 35 in phl. We were cleared to land and just crossing the threshold when tower cleared a commuter jet for takeoff from runway 8. There was a confusing cautionary statement made by the tower with the takeoff clearance; something along the lines of: 'cleared for takeoff runway 8; dash 8 landing runway 35; use caution for prop wash.' both my captain and myself were confused why they would get a caution like that. Right after we touched down; we saw grass and dust being blown across our runway from the full-power jet blast of the commuter jet. During our landing roll out; we went through the jet blast and were knocked quite forcefully off the centerline of the runway. My captain did a great job of maintaining control of the aircraft and keeping it on the runway. This event could have ended much worse; possibly running off the runway. The takeoff clearance was heard and noted by both my captain and myself; we both saw debris blowing across the runway; by that point we could only continue the landing; we both confirmed getting hit by jet blast. The event occurred because the proximity of runway 8 to runway 35 is close enough to cause jet-blast disruptions for aircraft landing on 35. The captain maintained control of the aircraft even when it was drifting off center line. I told the tower that we had been hit by the jet blast; but I never got a response. I believe this would have been avoided if the tower had waited 5 seconds for us to clear the blast zone of runway 8. The tower should not clear takeoffs from runway 8 when aircraft are landing runway 35; until the landing aircraft has cleared past runway 8. I felt this was a reckless move by the tower; and I am disappointed that this procedure is even considered. If it had been a smaller aircraft; I believe it would have been blown off the runway.

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Original NASA ASRS Text

Title: PHL Tower cleared a commuter jet for takeoff on Runway 8 just as a DHC8 was landing on Runway 35; leading to control problems for the DHC8 crew due to jet blast.

Narrative: The Captain was pilot flying and landing 35 in PHL. We were cleared to land and just crossing the threshold when Tower cleared a commuter jet for takeoff from Runway 8. There was a confusing cautionary statement made by the Tower with the takeoff clearance; something along the lines of: 'Cleared for takeoff Runway 8; Dash 8 landing Runway 35; use caution for prop wash.' Both my Captain and myself were confused why they would get a caution like that. Right after we touched down; we saw grass and dust being blown across our runway from the full-power jet blast of the commuter jet. During our landing roll out; we went through the jet blast and were knocked quite forcefully off the centerline of the Runway. My Captain did a great job of maintaining control of the aircraft and keeping it on the Runway. This event could have ended much worse; possibly running off the Runway. The takeoff clearance was heard and noted by both my Captain and myself; we both saw debris blowing across the Runway; by that point we could only continue the landing; we both confirmed getting hit by jet blast. The event occurred because the proximity of Runway 8 to Runway 35 is close enough to cause jet-blast disruptions for aircraft landing on 35. The Captain maintained control of the aircraft even when it was drifting off center line. I told the Tower that we had been hit by the jet blast; but I never got a response. I believe this would have been avoided if the Tower had waited 5 seconds for us to clear the blast zone of Runway 8. The Tower should not clear takeoffs from Runway 8 when aircraft are landing Runway 35; until the landing aircraft has cleared past Runway 8. I felt this was a reckless move by the Tower; and I am disappointed that this procedure is even considered. If it had been a smaller aircraft; I believe it would have been blown off the Runway.

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.