ACR B727 ON ILS RWY 05R GIVEN A GAR AT 100 FT AGL DUE TO UNKNOWN AND UNSEEN TFC. TWR ASSIGNED A L TURN TO 320 DEGS HDG THEN CHANGED IT TO A R TURN HDG 095 DEGS. TWR CTLR SOUNDED 'PANICKED.' SECOND CTLR TOOK OVER AND ACFT REVECTORED FOR ANOTHER ILS APCH. TCASII SPOTTED TFC ON THE GAR; BUT DID NOT GIVE A TA OR RA. LATER CONVERSATION WITH TWR SUPVR INDICATED A SYS ERROR.

Narrative

ACR X FLT SCHEDULED DTW-CLE. ACFT (B727). NORMAL OPS FROM DTW DEICE (DTW) APPROX 30 MINS GND DELAY FOR WX BELOW MINIMUM AT CLE DUE TO SNOW SQUALL. FLT OPERATED NORMAL ON STAR TO CLE. TOLD WE WERE #2 FOR ILS RWY 05R TFC ON SHORT FINAL. APCH REQUESTED SPD 210 KTS TO OM. TAILWIND ON APCH/LNDG; BUT WE SAID WE WOULD COMPLY. NEVER HANDED OFF TO TWR; APPROX 1/2-1 MI INSIDE OM; QUERIED APCH CTL; TOLD TO CONTACT TWR. CALLED TWR; CLRED TO LAND; TOLD TFC WAS ON RWY; CLRED TO LAND RWY 05R. APCH NORMAL. GND CONTACT AT 200 FT AGL. AT 100 FT AGL TWR SAID TO GAR. BEGAN MISSED APCH AS PUBLISHED. TOLD TO TURN TO 320 DEGS 'WHEN ABLE;' UP TO 4000 FT. READ BACK THEN IMMEDIATELY TOLD TO TURN ASAP TO 320 DEGS; CLB TO 4000 FT. READ BACK; THEN TOLD IN HIGH STATE OF PANIC TO TURN R TO 090 DEGS FOR TFC. READ BACK; AND AT THIS POINT ACQUIRED TFC ON TCASII (NO RA/TA; OR TA ONLY; AT ANY TIME). TFC APPEARED TO BE WITHIN 1/2 MI 100 FT ABOVE. EXECUTED 45 DEG R BANK IMMEDIATE LEVEL OFF. CTLR ONCE MORE STATED IN A PANIC TURN R 095 DEGS; DSND TO 2000 FT MSL. AT THIS POINT ANOTHER CTLR TOOK OVER. VECTORED FOR ANOTHER APCH RWY 05R (ILS). ALL OTHER OPS NORMAL. WE HAVE NO IDEA HOW CLOSE WE REALLY WERE; OF IF THIS WAS DEP; ARR TFC OR WHAT. WE FEEL WE FOLLOWED ALL PROCS CORRECTLY AND WOULD LIKE TO KNOW HOW IFR SEPARATION WAS LOST. SUPPLEMENTAL INFO FROM ACN 321594: CALLED TWR AFTER LNDG; AND SUPVR SAID GAR SHOULD HAVE BEEN TURN TO 320 DEGS; NOT 'WHEN ABLE.' ALSO AN ACR FLT WAS ANSWERING FOR OUR ACFT WHICH CAUSED THE CONFLICT; BUT HE DID ADMIT THE CTLR WAS IN ERROR.