AN SF340 FLC PERFORMS AN EVASIVE ACTION CLB AT 5000 FT IN RESPONSE TO A CLBING PILATUS SKYDIVING ACFT JUST 2 MI OUTSIDE OF THE CLASS B AIRSPACE OF DFW; TX.

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WHILE APPROX 33 DME FROM TTT AND ESTABLISHED ON LOC RWY 13R AT DFW PER ATC INSTRUCTIONS; A SINGLE ENG FIXED GEAR HIGH WING PILATUS ACFT WAS OBSERVED CLBING TOWARD US AT A VERY STEEP ANGLE OF ATTACK AND ANGLE OF CLB. WE WERE LEVEL AT 5000 FT AT THE TIME; BEING VECTORED BY APCH TO DFW. ALMOST SIMULTANEOUS WITH OUR SIGHTING OF THIS ACFT; WE FIRST RECEIVED A TA; THEN AN RA FROM OUR TCASII; AND ATC CALLED US WITH 'POP-UP TFC; 12 O'CLOCK POS; 3 MI; A PILATUS CLBING OUT OF 4500 FT.' OUR TCASII RA COMMANDED AT LEAST A 3000 FPM CLB; WHICH WE COMPLIED WITH. IT DID NOT STATE 'CLR OF CONFLICT' UNTIL WE WERE PASSING THROUGH 6000 FT MSL. THIS ACFT WAS APPARENTLY PART OF SOME PARACHUTE JUMPING GROUP; BUT ATC WAS SURPRISED BY HIS POS. THE VERY STEEP CLB ANGLE PROBABLY MADE THIS ACFT'S CREW DIFFICULT TO SEE OUR ACFT. WE HAD RECEIVED A TA ON THE OUTBOUND LEG FROM DFW TO LAW; AND IT WAS ALSO A JUMPER ACFT MANEUVERING. CONDITIONS WERE VMC; BUT THE SIT OF AN ACFT UNDER POSITIVE CTL BEING PLACED IN CLOSE PROX TO JUMP ACFT JUST DOES NOT MAKE GOOD SAFETY SENSE. SINCE DEC/99; I HAVE RECEIVED MORE RA'S IN THE DFW AREA THAN RA'S FROM ALL OTHER COMBINED AIRSPACE; AND IN EACH CASE; ATC KNEW OF THE OTHER ACFT'S PRESENCE. RELYING ON SEE AND AVOID WHERE TCASII LOGIC GENERATES RA'S REGULARLY IS A BAD ATC PRACTICE; AND THIS NEEDS TO STOP. OTHER PLTS IN THIS AIRSPACE WITH TCASII COMPLAIN OF SIMILAR REGULARITY OF RA'S IN DFW TRACON AIRSPACE.