Narrative:

While on short final to runway 27R; ATC issued a take-off clearance to a dash-8 from runway 35 at intersection kilo. I have encountered this from before; so I advised the first officer to expect a possible reaction from the aircraft because of their prop-blast and; prepare for a possible balked landing. While we were in the flare at approximately 10 feet and at flight idle; we passed through their prop-blast and we had a momentary shift to the left along our longitudinal axis. The first officer reacted very smoothly since it was expected and I shadowed the controls as he smoothly returned back to centerline. At no point was the aircraft put into an unstable condition on this event. We rolled out safely and exited the runway without further event. We advised ATC about the situation and a supervisor requested we speak with him on another radio to explain what happened. I informed him that I have encountered this several times and we should not have aircraft doing intersection departures with an aircraft directly behind them in a flare. He informed me that it's what they need to do in order to keep the flow of aircraft moving and they try to avoid having that exact situation occur; but can't control how long an aircraft takes in position or allowing a position and hold during an intersection departure at night.simple solution is we do not allow intersection departures when an aircraft is in a flare directly behind them or on short final with that amount of blast. The control stated that it is avoided at all costs by the dash-8 did not delay at any point and his takeoff clearance was given while he was on the taxiway holding short and we were at only a few hundred feet. I have personally experienced this once before while I was flying and we had to take excessive action. Luckily; we were prepared for it this time and the situation was handled well; but it can't be done; especially not at night. The takeoff clearance of the dash-8 was given way too late with us on short-final.

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Original NASA ASRS Text

Title: CRJ-200 Captain reported while on short final to Runway 27R at PHL; ATC cleared a turboprop aircraft on an intersection departure from Runway 35 which caused a momentary shift during the landing flare caused by the prop wash.

Narrative: While on short final to RWY 27R; ATC issued a take-off clearance to a Dash-8 from RWY 35 at intersection Kilo. I have encountered this from before; so I advised the First Officer to expect a possible reaction from the aircraft because of their prop-blast and; prepare for a possible balked landing. While we were in the flare at approximately 10 feet and at flight idle; we passed through their prop-blast and we had a momentary shift to the left along our longitudinal axis. The First Officer reacted very smoothly since it was expected and I shadowed the controls as he smoothly returned back to centerline. At no point was the aircraft put into an unstable condition on this event. We rolled out safely and exited the runway without further event. We advised ATC about the situation and a supervisor requested we speak with him on another radio to explain what happened. I informed him that I have encountered this several times and we should not have aircraft doing intersection departures with an aircraft directly behind them in a flare. He informed me that it's what they need to do in order to keep the flow of aircraft moving and they try to avoid having that exact situation occur; but can't control how long an aircraft takes in position or allowing a position and hold during an intersection departure at night.Simple solution is we do not allow intersection departures when an aircraft is in a flare directly behind them or on short final with that amount of blast. The control stated that it is avoided at all costs by the Dash-8 did not delay at any point and his takeoff clearance was given while he was on the taxiway holding short and we were at only a few hundred feet. I have personally experienced this once before while I was flying and we had to take excessive action. Luckily; we were prepared for it this time and the situation was handled well; but it can't be done; especially not at night. The takeoff clearance of the Dash-8 was given way too late with us on short-final.

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.