AN ACR DH8 FLC HAD VISUAL CONTACT ON A DC9 THAT PASSED OVER THEM; BUT THEIR TCASII EQUIP ISSUED AN 'RA' THAT REQUIRED A CLB. THE MAINT PERSONNEL FOUND NO PROBLEM WITH THE TCASII EQUIP.

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ATC INFORMED US THAT A JET HAD US IN SIGHT AT OUR 5 O'CLOCK POS AND WOULD CONTINUE CLB; WE GOT AN RA WITH A CLB COMMAND OF 1500 FT. FURTHER IT GAVE A CLB; XING CLB COMMAND OF 1500 FT AS WE ACQUIRED A VISUAL ON THE DC9 500 FT ABOVE US. I LEVELED OFF AT 9500 FT TO AVOID A COLLISION; THEN DSNDED BACK TO 9000 FT. HAD I CONTINUED THE CLB ACCORDING TO THE TCASII WE WOULD HAVE HIT THE DC9. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR WAS FLYING A DEHAVILLAND DASH 8- 300 AND WAS FAIRLY HEAVY AT THE TIME. HE SAID THAT HE STARTED TO PULL UP; BUT SAW THE DC9 AND STOPPED. HE HAD ALREADY ADVISED THE CTLR THAT HE WAS REACTING TO AN RA. HE THEN TOLD THE CTLR THAT THEY WERE GOING TO HOLD ALT. THE TCASII ADVISORY PEAKED AT 2000 FT CLB AND HELD THIS FOR A FEW MOMENTS EVEN THOUGH THE DC9 WAS ABOVE THEM. HE ENTERED THIS IN THE MAINT LOG. THIS ANALYST ASKED IF THE DC9 HAD BEEN DSNDING OVER THEM PRIOR TO HIS SIGHTING AND HE SAID THAT HE DID NOT KNOW. HE DID CHK WITH MAINT PERSONNEL SEVERAL DAYS LATER AND FOUND THAT THE TCASII DID PASS ALL OF THE MAINT CHKS AT THE COMPANY AND AT THE CONTRACT SERVICE FACILITY. THE RPTR ALLEGED THAT HIS COMPANY'S TRAINING ON THE TCASII IS INADEQUATE AND THAT HE DOES NOT TRUST THE EQUIP.