SMA BEING TURNED ONTO FINAL APCH IFR IS ISSUED A VECTOR TO ALLOW ANOTHER ACFT TO PASS. PLT FEELS CTLR CONFUSION AT FAULT.

Narrative

WHILE ON AN IFR FLT PLAN FROM ESN TO ISP; BEING HANDLED BY NY APCH; RADAR VECTORS FOR ILS 6 (ISP) FOLLOWING THE CTLRS LAST INSTRUCTION 3000 FT; HDG 030 INTERCEPT LOC. AFTER INTERCEPTING THE LOC AND BEGINNING DSCNT (IN MARGINAL VFR IN HAZE) ANOTHER CTLR ISSUED AN INSTRUCTION FOR AN IMMEDIATE R TURN TO A HDG OF 180 DEGS WHICH WAS PERFORMED. DURING THE APCH MY PAX (ALSO A RATED PLT) OBSERVED AN SMA TYPE OF ACFT XING THE LOC AND CALLED OUT TFC WHICH WE BOTH HAD IN SIGHT. WHEN I INQUIRED (TO THE FIRST CTLR) 'WHO' ISSUED THE INSTRUCTION FOR THE TURN TO 180 SHE WAS UNABLE TO REPLY AND THE SECOND CTLR CAME BACK AND SAID 'I DID' IN A BOOMING VOICE WITH NO EXPLANATION. IT WAS CLR THAT A CERTAIN AMOUNT OF CONFUSION EXISTED (ON THE PART OF THE CTLRS) AS TO THE POS OF OUR 2 ACFT. I FEEL THAT MY ACFT; ON THE APCH; WITHIN 2 MI OF THE OM; AND ON AN IFR FLT PLAN; WAS INADVERTENTLY PLACED ON A CONFLICTING COURSE WITH ANOTHER ACFT XING THE LOC (FOR SOME UNKNOWN PURPOSE) BY POSSIBLY A TRAINEE CTLR; AND THEN HAD TO DIVERT DUE TO THE INATTN OF THE SUPVR.