LTT HAS DEER STRIKE ON TKOF.

Narrative

FLT WAS DEPARTING RWY 27 AT IPT FOR A SCHEDULED REVENUE FLT TO PITTSBURG; PA; WHEN JUST AFTER V1 SPD; A DEER WAS SPOTTED RUNNING DOWN THE RWY TOWARD THE L SIDE OF OUR ACFT. WE SAW THE DEER AND ROTATED HARD IN ATTEMPT TO BECOME AIRBORNE PRIOR TO IMPACT. WE STRUCK THE DEER WITH OUR L MAIN LNDG GEAR AND L FLAP; JUST INBOARD OF THE L ENG NACELLE. ONCE AIRBORNE AND AT POSITIVE RATE OF CLB WE SELECTED GEAR UP AND RECEIVED ONLY UNLOCKED 'INTRANSIT' LIGHTS ON THE R MAIN AND NOSE GEAR. THE L MAIN STAYED LOCKED DOWN WITH A GREEN INDICATION. WE THEN LOOKED TO OUR HYD INSTS AND FOUND WE HAD A COMPLETE LOSS OF HYD PRESSURE FROM THE ENG DRIVEN PUMPS. ALL THAT REMAINED WAS 1500 PSI PRESSURE IN OUR MAIN ACCUMULATOR AND 1000 PSI IN OUR EMER SUPPLY ACCUMULATOR. WE THEN SELECTED GEAR DOWN AND RECEIVED A DOWN AND LOCKED FROM THE NOSE GEAR; BUT NOT FROM THE R MAIN. THE R MAIN DID; HOWEVER; LOCK DOWN A FEW MINS LATER JUST PRIOR TO EMER PUMPING ON OUR PART. MY FO TOLD THE ATC FACILITY OF THE DEER STRIKE AND REQUESTED HOLDING AT IPT VOR TO WORK THROUGH THE PROB. WHILE HOLDING AT THE VOR WE PASSED ON OUR PREDICAMENT TO OUR OPS AND MY FO WENT BACK TO INSPECT THE DAMAGE TO THE L FLAP. WE FOUND A 6 INCH BY 3 INCH PIECE MISSING AND THE L FLAP WAS BENT UP WHERE THE IMPACT HAD OCCURRED. WE MADE THE DECISION TO DECLARE AN EMER AND PROCEED TO MDT FOR LNDG DUE TO THE LONGER AND WIDER RWY; AND EMER EQUIP AVAILABLE THERE. WE EXPECTED TROUBLE WITH BRAKES AND POSSIBLY STEERING DUE TO HYD FAILURE; AND HAD GOOD REASON TO BELIEVE THAT WE HAD NO BRAKE AVAILABLE ON THE L MAIN DUE TO SEVERED HYD LINE. WE WORKED TOGETHER VERY WELL TO ASSURE THAT WE THOROUGHLY BRIEFED EVERY POSSIBILITY THAT MIGHT OCCUR; INCLUDING LNDG GEAR FAILURE; EVEN THOUGH WE HAD 3 GREEN LOCK DOWN INDICATIONS. THE L MAIN; HOWEVER; BROKE OFF THE WING 300-400 FT AFTER TOUCHDOWN AND WE SKIDDED TO A STOP FURTHER DOWN THE RWY. THE ACFT WAS THEN SECURED AND WE EVACED. THERE WERE NO PAX ON BOARD THIS FLT; AND NO INJURIES TO THE CREW.