FLC OF A LTT BUSINESS JET LOST CTL OF THE ACFT DURING TKOF ROLL RESULTING IN THE ACFT GOING OFF THE SIDE OF THE RWY CAUSING DAMAGE TO ONE WHEEL AND TIRE.

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WE TAXIED TO DEP END OF RWY 35 AT PHL WHERE WE HELD CLR OF THE RWY WHILE A TWIN LANDED ON RWY 35; SHORTLY AFTER A B747 LANDED ON RWY 27R. AS SOON AS THIS ACFT CLRED OUR RWY WE WERE CLRED FOR TKOF. WE COMPLETED THE TKOF CHKLIST AND TAXIED INTO POS; WHERE THE CAPT ADVANCED THE PWR LEVERS AND ASKED THAT I SET PWR. I SET TKOF PWR AND ADVISED THE CAPT. NEXT I MONITORED ALL COCKPIT INSTS AND ANNUNCIATORS; I THEN CALLED OUT AIRSPD ALIVE AND THE CAPT ACKNOWLEDGED. VERY SHORTLY THEREAFTER I WITNESSED A ROUGH RIDE AND SOME UNUSUAL NOISE. IT WAS AT THIS TIME I REALIZED WE WERE OFF THE RWY AND THE CAPT ABORTED THE TKOF. THE ACFT CAME TO A REST ABOUT 20 FT OFF THE L SIDE OF RWY 35 AND 900-1000 FT DOWN THE RWY. I BELIEVE WE EITHER HAD A STEERING PROB OR THE WINGTIP VORTICES OF THE INTERSECTING LNDG ACFT CAUSED THIS ACFT TO DEPART THE RWY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT SUBSEQUENT INVESTIGATION OF THIS INCIDENT DID NOT REVEAL ANY MECHANICAL PROB WITH THE NOSE GEAR STEERING OR ANY OTHER MALFUNCTION. THE ACFT; LEAR JET 55; RECEIVED DAMAGE TO A WHEEL AND TIRE WHEN GOING OFF THE SIDE OF THE RWY. THE FLC STILL BELIEVES THAT IT MUST HAVE BEEN THE R WING VORTEX AS IT PASSED OVER THE INTERSECTING RWYS AND SETTLED DOWN ON THE DIRECT FLT PATH OF THEIR ACFT AS IT MADE THE TKOF ROLL. HOWEVER; THE CAUSE OF THE INCIDENT HAS BEEN CLASSIFIED AS THEIR FAULT AND IS NOTED IN THEIR PLT RECORDS.