GA SMA HAS A TAXI DELAY DUE TO A STUCK MICROPHONE.

Narrative

DURING A DUAL XCOUNTRY FLT WE MADE A PLANNED STOP FOR FUEL AT AMARILLO INTL; AMARILLO; TX. WE WERE FLYING AN SMA WHICH WAS IFR EQUIPPED AND HAD A PORTABLE INTERCOM SYS. THE INTERCOM WAS CONNECTED TO THE RADIOS; BUT THERE IS ONLY 1 PUSH TO TALK SWITCH WHICH IS ON THE PLT'S YOKE. WE WERE INSTRUCTED TO CLR THE RWY AND CONTACT GND ON 121.9. GND CTL THEN INSTRUCTED US TO TAXI UP TO THE NEXT TAXIWAY AND HOLD FOR GND TFC. AFTER HOLDING FOR APPROX 5 MINS; THE MICROPHONE BUTTON ON THE PLT'S YOKE CAME UNSTUCK. I'M NOT SURE OF THE EXACT CONVERSATION THAT OCCURRED; BUT THERE WERE MOST LIKELY SEVERAL FCC VIOLATIONS FOR LANGUAGE. ONCE THE MICROPHONE BUTTON WAS UNSTUCK WE WERE INSTRUCTED TO TAXI TO PARKING AND THAT WE HAD MADE FOOLS OF OURSELVES (WHICH IS TRUE). WE WERE NOT ASKED TO CONTACT ANYONE AT THE TWR OR ANY OTHER FACILITY. THE CTLRS WERE VERY PROFESSIONAL AND ACTED AS IF NOTHING HAD HAPPENED. AND I MADE ALL THE RADIO CALLS WITH AN EXTRA HAND MICROPHONE ON THE WAY OUT. THE ACFT IS EQUIPPED WITH THE OLD STYLE RADIO. THERE IS NO VISUAL XMISSION INDICATOR. TO MY KNOWLEDGE THIS IS THE FIRST INCIDENT IN THIS ACFT OF THE MICROPHONE BUTTON STICKING WHILE THIS STUDENT HAS OWNED THE AIRPLANE (APPROX 2 MONTHS). I DON'T KNOW OF ANY WAY THIS COULD HAVE BEEN AVOIDED OTHER THAN A LITTLE MORE PROFESSIONALISM IN THE COCKPIT.