PA34 PLT LNDG HPN GIVEN 3 LNDG CHANGES.

Narrative

WE WERE CLRED TO LAND ON RWY 16 AT WESTCHESTER COUNTY ARPT; NY; HPN. THE WIND AT THE TIME WAS FROM 180 DEGS. WHILE ON CLOSE IN BASE LEG AT APPROX 600 FT AGL; READY TO TURN FINAL; THE CLRNC WAS CHANGED TO FLY THROUGH THE CTRLINE OF RWY 16 AND ENTER THE BASE LEG FOR RWY 11; AS THERE WAS A JET ON A LONG FINAL TO RWY 16. AFTER QUESTIONING THE NEED FOR THIS CHANGE; AT THIS LATE STAGE OF THE APCH; WE CONTINUED TO BASE LEG RWY 11 AND WERE CLRED TO LAND RWY 11. WHILE CLOSE IN AT APPROX 600 FT WE WERE GIVEN THE INSTRUCTION TO MAKE A R 270 DEG TURN; CLRED TO LAND RWY 11. AGAIN WE QUESTIONED THIS INSTRUCTIONS AS IT WOULD PUT US IN POS FOR A R BASE TO RWY 16. THE CTLR CONFIRMED THE INSTRUCTION AND CLRNC TO LAND ON RWY 11. WE PROCEEDED TO MAKE A 360 DEG TURN; THEN TURNED FINAL AT WHICH TIME I NOTICED THAT IF WE CONTINUED THE LNDG WE WOULD COLLIDE WITH A KING AIR; WHICH WAS LNDG ON RWY 16; AT THE INTXN OF RWYS 11 AND 16. AT ABOUT 200 FT AGL; I ADVISED THE CTLR OF THE INTXN 'MEETING.' AT THIS POINT ANOTHER VOICE; POSSIBLY A SUPVR; ISSUED INSTRUCTIONS FOR US TO GO AROUND AND LAND ON RWY 16. THE ORIGINAL CTLR GAVE US 3 CHANGES TO OUR LNDG CLRNCS; EACH OF WHICH WAS AN UNNECESSARY DISTR AND THE LAST WHICH PUT US IN A POS FOR A RWY INTXN COLLISION. FRIDAY AFTERNOONS ARE EXTREMELY BUSY AT THIS ARPT. THE USE OF INEXPERIENCED OR OTHERWISE UNQUALIFIED CTLRS AND THE LACK OF APPROPRIATE SUPERVISION WERE THE REASONS FOR THIS SERIES OF ERRORS. PROVIDING EFFECTIVE; QUALITY SUPERVISION AT BUSY TIMES MIGHT ALLEVIATE THIS PROB.