A GA SMT PLT HAS A STUCK MIKE ON A LAX TRACON FREQ WHILE APCHING SMO. THE PLT LATER FOUND OUT THAT THIS IS A RECURRENT PROB WITH THIS PARTICULAR ACFT.

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I WAS ON APCH (VIA VFR) INTO SMO WHEN SOCAL TRACON HELD ME AT 4500 FT TO ALLOW A BARON TO PASS UNDERNEATH ME. I WAS APPROX 10-12 MI OUT FROM SMO; JUST SW OF THE DARTS INTXN. AFTER ACKNOWLEDGING THE CALL; I NOTICED THAT A LITTLE TIME HAD GONE BY (APPROX 30-45 SECONDS); THE BARON MUST HAVE PASSED BENEATH ME SO I SHOULD BE GETTING CLRED LOWER; AND I WAS A LITTLE BIT HIGH TO MAKE THE APCH INTO SMO. I ATTEMPTED TO CONTACT SOCAL; BUT GOT NO RESPONSE. AFTER ANOTHER 30 SECONDS OR SO AND SEVERAL MORE TRIES; I REALIZED I HAD A STUCK MIKE. I BEGAN CHKING EACH OF THE MIKES AND COULD NOT CLR THEM; I SWITCHED THE COM PANEL TO SPEAKER; UNPLUGGED THE HEADSETS; RECYCLED MY AVIONICS (IE; SHUT THEM DOWN AND STARTED THEM BACK UP); ALL TO NO AVAIL. I WAS EVENTUALLY ABLE TO HEAR SMO TWR; BUT COULD NOT COMMUNICATE. INCIDENTALLY; I WAS FLYING A PLANE LOAD (4 CHILDREN) TO AN AIDS CAMP IN SOCAL FOR A CHARITY. ABOUT A MI AND A HALF OUT AT 1700 FT AGL; I HEARD SMO TWR CLR ME FOR A LNDG; BUT I WAS TOO HIGH. I EXTENDED MY GEAR; TURNED ON MY LIGHTS; DSNDED TO PATTERN ALT; FLEW BY THE TWR; SAW THE GREEN LIGHT; TURNED XWIND DOWNWIND; SAW THE GREEN LIGHT AGAIN; ROCKED MY WINGS; HEARD THE TWR TELL TFC IN THE AREA THAT I HAD SEEN THE GREEN LIGHT AND HAD ROCKED MY WINGS IN RESPONSE; TURNED BASE AND FINAL; AND LANDED WITHOUT INCIDENT. AFTER I TAXIED TO PARKING; I WAS ASKED TO CALL SOCAL TRACON WHERE THE SUPVR PROCEEDED TO YELL AT ME FOR BEING ESSENTIALLY STUPID; INCONSIDERATE; SLOW TO RESPOND TO THE OBVIOUS PROB; AND HAVING TIED UP ONE OF SOCAL TRACON'S BUSY FREQS FOR 20 MINS. APPARENTLY; THE INTERCOM (ALL THE CHILDREN WERE WEARING HEADSETS ATTACHED TO THE INTERCOM) WAS FEEDING DIRECTLY THROUGH THE XMITTER; SO ATC HEARD ALL THE CHILDREN; AND THAT APPARENTLY BOTHERED THEM TOO. I TOLD THEM IT HADN'T BEEN 20 MINS (IT WAS LESS THAN 10 SINCE THE AIRPLANE WAS DOING 150 KTS. WHEN THE INCIDENT BEGAN I WAS ONLY 10 MI OUT); AND I CLRED THE SOCAL TRACON FREQ WITHIN LESS THAN 5 MINS. I RECOGNIZED THE PROB IN LESS THAN A MIN; AND IMMEDIATELY BEGAN TRYING TO RESOLVE IT. I LATER LEARNED FROM OUR MECH THAT THIS PROB HAD OCCURRED BEFORE; BUT NO ONE HAD INFORMED ME. WE HAVE A FAIRLY SOPHISTICATED TELEPHONE/STEREO/INTERCOM/COMS SETUP IN THE AIRPLANE; AND APPARENTLY FOR REASONS THAT ARE AS OF YET INDENTED; THE #2 COM PANEL SIMPLY BEGINS XMITTING ALL THE INTERCOM CONVERSATION. IT CERTAINLY WOULD HAVE BEEN NICE HAD I KNOWN THIS. IN ANY EVENT; GIVEN THE NATURE OF THE PROB; THE FACT THAT I WAS IN EXTREMELY BUSY AIRSPACE; I THINK I DID A PRETTY GOOD JOB OF MINIMIZING DISRUPTION AND MAKING A SAFE APCH AND LNDG.