ACR MLG ALT DEV OVERSHOT IN RESPONSE TO TCASII RA.

Narrative

IN DSCNT TO MLB ABOUT 30 MI N; CREW NOTICED CONFLICTING TFC ON TCAS. CREW IN MLG ON 170 DEG VECTORS PASSING 7000 FT FOR 6000 FT. TFC WAS 12 O'CLOCK; 3 MI; 500 FT. CREW QUESTIONED ATC (ORLANDO APCH) ABOUT TFC AND WAS INFORMED IT WAS VFR TFC AT 6500 FT. AT ABOUT 2 MI FROM TFC; 6700 FT DSNDING; A TFC ADVISORY WAS GIVEN BY THE TCAS; PLT COMMENCED HARD R TURN. SHORTLY THEREAFTER AN RA WAS GIVEN BY TCAS WHICH COMMANDED A 3000 FPM DSCNT. PLT FOLLOWED COMMANDS ON TCAS AS SHOWN ON VSI. WHEN RA EXTINGUISHED AND TFC CLRED; LEVELED ACFT AT 5200 FT; THEN CLBED BACK TO 6000 FT. THE CONCERN HERE IS THAT ATC (ORLANDO APCH) DIDN'T CALL THE TFC IN THE FIRST PLACE; AND THEN WHEN QUESTIONED BY THE CREW ABOUT TCAS INFO; NEVER GAVE ANY TFC CLRNC COMMANDS AND NEVER ACTED CONCERNED. WITHOUT TCAS AND PROMPT PLT ACTIONS; THIS COULD VERY WELL HAVE BEEN A MIDAIR. IN FACT; AFTER THE INCIDENT THE CTLR DID NOT ACT CONCERNED. THIS BRINGS THE FOLLOWING QUESTIONS TO MIND: IS THE CTLR PROPERLY TRAINED AND QUALIFIED? IS THE CTLR MOTIVATED? WHERE IS HIS SUPVR? HAVE THE CTLRS RELAXED NOW THAT TCAS IS INSTALLED IN MOST AIRLINERS?