ALTDEV ALT EXCURSION IN RESPONSE TO TCASII RA.

Narrative

ON OUR INITIAL CALL TO RALEIGH APCH WE ADVISED THEM OF THE TFC POINT OUT FROM CTR AND THAT WE DID NOT HAVE THE ACFT EITHER VISUALLY OR ON TCASII DISPLAY. RALEIGH CONFIRMED THE TRACK AND ALT AND SQUAWK ON THE TFC. WE VISUALLY ACQUIRED WHAT APPEARED TO BE A WHITE SMA ACFT TRAVELING EBOUND APPROX 6 MI FROM OUR ACFT. THE ACFT APPEARED TO BE AT THE APPROPRIATE VFR ALT OF 3500 FT TRAVELING EBOUND. WE ADVISED RALEIGH APCH THAT WE HAD THE TFC VISUALLY AND THEN REQUESTED REVERIFICATION FROM THE CTLR THAT HIS TRANSPONDER AND MODE C WERE OPERATING AND ADVISED RALEIGH APCH THAT WE WERE NOT RECEIVING A TCASII DISPLAY OF THE ACFT. THE CTLR VERIFIED AGAIN THIS TRACK AND ALT READOUT. THE TCASII UNIT THEN DISPLAYED THE ACFT MOMENTARILY AT THE TOP OF THE DISPLAY AS 'PROXIMATE TFC.' HOWEVER; THE TCASII UNIT DID NOT TRACK THE ACFT AND THEN THE ACFT DISAPPEARED FROM THE TCASII DISPLAY. WE MAINTAINED VISUAL SURVEILLANCE ON THE ACFT AS THE SMA PASSED OFF OUR 9 O'CLOCK POS. SUDDENLY THE TCASII UNIT DISPLAYED A TA SYMBOL TOUCHING THE L WING OF THE TCASII DISPLAY ACFT. THE AURAL WARNING SYS ANNOUNCED 'TFC; TFC' THEN THE DISPLAY ACFT. THE RA COMMANDED A CLB RATE OF 1500 FPM. THE AURAL WARNING SYS ANNOUNCED 'CLB; CLB' BUT ONLY TWICE. WE IMMEDIATELY INITIATED A CLB TO COMPLY WITH THE RA AND SIMULTANEOUSLY NOTIFIED ATC THAT WE WERE INITIATING A 'TCASII DIRECTED CLB.' AT 4300 FT MSL THE DISPLAY RETURNED THE VSI/TRA MODE; HOWEVER; THE AURAL WARNING SYS DID NOT ISSUE A 'MONITOR VERT SPD' OR 'CLR OF CONFLICT' ADVISORY. WE RETURNED TO OUR ASSIGNED ALT OF 4000 FT MSL AND THE CTLR THEN ADVISED US TO CALL THE TWR ONCE WE LANDED. I CONTACTED THE RALEIGH TRACON SUPVR WHO INFORMED ME THAT 'THEY' WERE REQUIRED TO FILE AN ALT DEV RPT AND CONFLICT ADVISORY AGAINST MY CERTIFICATE EVEN THOUGH THE ACTION WAS TCASII INITIATED.