ACFT LNDG GEAR LOWERED VIA EMER METHODS THAT CANNOT BE RAISED; FLC DOES NOT DECLARE AN EMER; AND; HAS TO BALK THE LNDG INTO THE WAKE OF A DEPARTING JET.

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FLT X FEB/SUN/95 DEPARTED FLINT MICHIGAN FOR PITTSBURGH; PA; AT XA00 PM. ON APCH (ILS 28R) TO PITTSBURGH WE SELECTED THE LNDG GEAR TO THE DOWN POS JUST PRIOR TO THE OM. THE LNDG GEAR WOULD NOT COME DOWN AT ALL. WE EXECUTED MISSED APCH AND ASKED FOR SOME AIRSPACE N OF THE ELWOOD CITY VOR IN ORDER TO WORK ON OUR GEAR PROB. WE FOLLOWED QRH PROCS AND WERE ABLE TO SUCCESSFULLY EXTEND THE GEAR USING THE ELECTRICAL OVERRIDE SYS. WE WERE ABLE TO OBTAIN 6 GREEN (GEAR DOWN) LIGHTS. WE ASKED FOR VECTORS BACK TO THE APCH FOR PITTSBURGH. AS A PRECAUTION; I ASKED FOR THE EMER TRUCKS TO BE STANDING BY THE RWY IN CASE THE GEAR CTL MODULE WAS GIVING US ANY SORT OF FALSE GEAR DOWN INDICATION. INSIDE THE OM THE TWR CTLR CLRED ANOTHER COMMUTER FOR DEP. HE THEN CALLED A ACR JET TO TAXI INTO POS AND HOLD; AND BE READY FOR AN IMMEDIATE DEP. THE ACR JET DID NOT RESPOND TO THE TWR'S CALL. THE CTLR CALLED THE JET AGAIN; WITH NO RESPONSE FROM THE JET. ON THE 3RD CALL THE JET RESPONDED AND MY ACFT WAS ON ABOUT 1 1/2 MI FINAL. I THOUGHT THE CTLR WOULD TELL THE JET TO DISREGARD AND HOLD SHORT OF RWY 28R. TO OUR AMAZEMENT HE CLRED THE DC-9 JET FOR AN IMMEDIATE TKOF. THE DC-9 JET TOOK A LITTLE LONGER THAN USUAL TO LINE UP ON THE RWY AND START HIS TKOF ROLL. WHEN HE FINALLY DID I WAS ON ABOUT A 1/4 MI FINAL. WHEN I GOT DOWN TO ABOUT 200 FT AGL THE DC-9 WAS STILL ROLLING ON THE GND. WHEN I WAS A LITTLE LESS THAN 100 FT AGL; THE DC-9 WAS JUST ROTATING. AT THIS POINT I ENCOUNTERED JET BLAST RWY DEBRIS AND WAKE. OUR ACFT BANKED SHARPLY L AND R AND PITCHED UP AND DOWN. IN ORDER TO AVOID A CATASTROPHIC LNDG I WAS FORCED TO ADD PWR AND GAR WITH THE GEAR STUCK IN THE DOWN POS. THERE WAS NOT ADEQUATE SEPARATION AND I COULD HAVE LED TO DISASTER. WHAT IF THE DC-9 HAD ABORTED TKOF; WAS THE CTLR EXPECTING ME TO LAND RIGHT BEHIND HIM AND POSSIBLE COLLIDE?? AFTER THE GAR; THE CTLR SAID I WOULD BE ON ABOUT AN 18 MI FINAL. I TOLD HIM THAT WAS UNACCEPTABLE DUE TO THE FACT I HAD BEEN AT A LOW ALT TOO LONG ALREADY; BURNING A LOT OF FUEL. HE THEN TOOK SOME ACFT OFF THE APCH AND GOT US IN A LOG QUICKER. WE LANDED UNEVENTFULLY. THE GEAR WAS OBVIOUSLY DOWN; NO PAX INJURIES OR PROBS. TOTAL FLT TIME WAS 1 HR 46 MINS. WE DID LAND WITH ADEQUATE FUEL RESERVES. TWR CTLR HAD NO BUSINESS CLRING THAT JET FOR DEP.