A C560XL CAPT; ON THE ILS RWY 24 APCH TO CRQ; RESPONDED TO A TCASII RA TO CLB; WHILE IN THE VICINITY OF ESCON INTXN.

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FLT ORIGINATED IN PSP; IFR TO CRQ. AFTER TRM; WE WERE CLRED TO ESCON INTXN ON THE ILS RWY 24 APCH TO CRQ. WE WERE CLRED TO 5500 FT; HDG 240 DEGS AND 170 KIAS FOR SEQUENCING INTO CRQ. SOCAL CALLED TFC AT OUR 12 O'CLOCK POS; ABOUT 1000 FT BELOW AND DSNDING AND WITHIN ABOUT 3 MI. WE SAW THE TFC AND RPTED IT IN SIGHT; MOVING FROM OUR L TO R (SE ACFT). TCASII GAVE US A TA; WHICH THEN WENT AWAY. SOCAL THEN DSNDED US TO 3500 FT AND A HDG OF 210 DEGS AND CLRED US FOR THE APCH (ABOUT 2 MI NE OF ESCON). WE STARTED THE DSCNT TO 3500 FT. WE WERE ON A 210 DEG HDG AND ABOUT 4000 FT AND SUDDENLY WE RECEIVED THE RA TO 'CLB.' WE DID NOT RECEIVE A TA PRIOR; JUST AN RA COMMAND. I LOOKED TO OUR R AND SAW AN ACFT TURNING SHARPLY TOWARDS US AS IF PRACTICING SOME MANEUVERS. WE INITIATED A CLB AND WENT TO ABOUT 4500 FT AND ADVISED SOCAL. THE RA THEN WENT AWAY AND WE CONTINUED THE APCH AND LANDED WITHOUT FURTHER INCIDENT. THIS IS THE SECOND TIME IN 2 WKS THAT I HAVE RECEIVED AN RA INTO CRQ. TA'S ARE ALWAYS COMMON AS WELL. IT SEEMS THAT VFR PLTS ARE UNAWARE OF THE APCH PATH INTO CRQ FOR THE ILS RWY 24 AND ARE COMMONLY MANEUVERING IN THE VICINITY OF ESCON INTXN. CRQ IS A BUSY; POPULAR ARPT. BUT WITH THE AMOUNT OF JET TFC; THERE NEEDS TO BE MORE AWARENESS OF THE ARRS; IE; ILS RWY 24; BY LCL AND TRANSIENT PLTS (GA). POSSIBLY AN ENHANCEMENT OR EXPANSION OF THE CLASS D AIRSPACE MAY BE REQUIRED.