Narrative:

This was to be a training flight to practice instrument approachs in a radar environment with ATC vectors. The flight en route was VFR in controled airspace but no ATC contact was to be initiated until contacting sgf approach. To facilitate instruction and assist student with ATC instructions, headsets/intercom were used. During taxi, both student and I checked the intercom connections/push-to-talk switches and both transmitted to unicom, each on a separate radio and push-to-talk. Both received 'loud and clear' to radio checks. We proceeded believing intercom/headsets/push-to-talks were operating correctly. En route, the student selected the approach frequency for sgf early - - about 60 NM north. Since we were practicing radial tracking and intercepts, we had the audio panel to off so we heard nothing over the radio and could talk over the intercom without distrs. We proceeded to about 20-25 NM north of sgf where the student attempted to contact approach. (We had earlier (approximately 5-10 NM) attempted to listen to ATIS but received nothing. I (erroneously) assumed the ATIS was being updated.) at first, we were unsuccessful in contacting approach. I verified frequency, audio switch setting, etc. Everything appeared correct. The student attempted contact once more. This time our transmission was met with the following response. 'You have had a stuck microphone for the past 25 mins' and then the most derisive, contemptuous laughter I have ever had the misfortune to hear. At that point (not knowing whether this came from a controller or other party on the frequency), I decided we had 'entertained' sgf long enough. I had the student turn the airplane northbound.

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Original NASA ASRS Text

Title: INSTRUCTOR AND TRAINEE FLY FOR 25 MINS WITH STUCK MIKE XMITTING THEIR INTERCOM CONVERSATION.

Narrative: THIS WAS TO BE A TRAINING FLT TO PRACTICE INST APCHS IN A RADAR ENVIRONMENT WITH ATC VECTORS. THE FLT ENRTE WAS VFR IN CTLED AIRSPACE BUT NO ATC CONTACT WAS TO BE INITIATED UNTIL CONTACTING SGF APCH. TO FACILITATE INSTRUCTION AND ASSIST STUDENT WITH ATC INSTRUCTIONS, HEADSETS/INTERCOM WERE USED. DURING TAXI, BOTH STUDENT AND I CHKED THE INTERCOM CONNECTIONS/PUSH-TO-TALK SWITCHES AND BOTH XMITTED TO UNICOM, EACH ON A SEPARATE RADIO AND PUSH-TO-TALK. BOTH RECEIVED 'LOUD AND CLR' TO RADIO CHKS. WE PROCEEDED BELIEVING INTERCOM/HEADSETS/PUSH-TO-TALKS WERE OPERATING CORRECTLY. ENRTE, THE STUDENT SELECTED THE APCH FREQ FOR SGF EARLY - - ABOUT 60 NM N. SINCE WE WERE PRACTICING RADIAL TRACKING AND INTERCEPTS, WE HAD THE AUDIO PANEL TO OFF SO WE HEARD NOTHING OVER THE RADIO AND COULD TALK OVER THE INTERCOM WITHOUT DISTRS. WE PROCEEDED TO ABOUT 20-25 NM N OF SGF WHERE THE STUDENT ATTEMPTED TO CONTACT APCH. (WE HAD EARLIER (APPROX 5-10 NM) ATTEMPTED TO LISTEN TO ATIS BUT RECEIVED NOTHING. I (ERRONEOUSLY) ASSUMED THE ATIS WAS BEING UPDATED.) AT FIRST, WE WERE UNSUCCESSFUL IN CONTACTING APCH. I VERIFIED FREQ, AUDIO SWITCH SETTING, ETC. EVERYTHING APPEARED CORRECT. THE STUDENT ATTEMPTED CONTACT ONCE MORE. THIS TIME OUR XMISSION WAS MET WITH THE FOLLOWING RESPONSE. 'YOU HAVE HAD A STUCK MIKE FOR THE PAST 25 MINS' AND THEN THE MOST DERISIVE, CONTEMPTUOUS LAUGHTER I HAVE EVER HAD THE MISFORTUNE TO HEAR. AT THAT POINT (NOT KNOWING WHETHER THIS CAME FROM A CTLR OR OTHER PARTY ON THE FREQ), I DECIDED WE HAD 'ENTERTAINED' SGF LONG ENOUGH. I HAD THE STUDENT TURN THE AIRPLANE NBOUND.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.