AN ACR LGT HAD A TCASII CLB COMMAND. IT FOLLOWED THE COMMAND; THEN RESUMED ALT. THE OTHER ACFT WAS SEEN ON RADAR AND VISUALLY.

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WE WERE ON RADAR VECTORS 30 S OF LGA INBOUND TO LGA AT 9000 FT. CTLR CALLED TFC AT 8500 FT AT 12 O'CLOCK AT 3 OR 4 MI. TCASII RESPONDED WITH A TA. WE HAD NO VISUAL SIGHTING OF THE TFC. THEN THE TCASII RESPONDED WITH AN RA OF CLB. WE CLBED IMMEDIATELY TO APPROX 9400 FT AND THE TCASII THEN SHOWED 'RED' AT 0 FPM CLB VERSUS THE PREVIOUS 'RED' 1500 FT CLB. THEN THE TCASII WAS CLR. THEN THE CTLR SAID HE HAD US AT 9500 FT AND THE TFC HAD US IN SIGHT AND WAS NO FACTOR. AFTER THE TCASII WAS CLR WE DSNDED BACK TO 9000 FT. THE CTLR SOUNDED DISTURBED BY THE EVENT AND SO WERE WE. I CALLED THE APCH CTL BY PHONE AFTER WE WERE ON THE GND AT LGA. THEY SAID THEY APPRECIATED THE CALL AND THE EXPLANATION ABOUT THE TCASII RA. THEY SAID THERE HAD BEEN NO CONFLICT OF TFC. TO BE IN A HVY TFC AREA LIKE LGA AND GET AN RA IS PERPLEXING TO SAY THE LEAST BECAUSE IT PRESENTS A HESITATION IN YOUR ACTION OR REACTION. THIS HESITATION IS CAUSED BY A FEAR THAT THERE IS MORE DANGER IN LEAVING YOUR POS THEN STAYING WHERE YOU ARE PLUS THE OTHER BIG FEAR THAT'S ALWAYS BUMPING SAFETY IN THE BUTT AND THAT IS A VIOLATION. THE INITIATION OF FOLLOWING THE RA WAS PROBABLY DELAYED BY A SECOND BECAUSE OF THE ABOVE EXPLAINED QUANDARY. BUT PREVIOUS EXPERIENCE EARLIER THIS MONTH IN AN ACFT WITHOUT A TCASII PUSHED THE HESITATION FROM MY MIND. PREVIOUS RELIABILITY OF EQUIP ALSO SAID TO MY MIND -- 'CLB NOW.' EVERYTHING WORKED WELL. WE NEVER SAW THE TFC -- I WOULD DO THE SAME AGAIN.