Narrative:

While awaiting at intersection G7, I called ATC for takeoff clearance. ATC advised that the radio was unreadable and advised trying another radio. I switched to another radio and requested a radio check. ATC advised that it too was poor, but readable. There were several other xmissions taking place along with radio noise. Other aircraft were behind me when I believed to have heard 'taxi into position.' (intersection G7 is in an area where only takeoffs occur and is approximately 789 ft from the landing threshold.) as I did so, I observed a katana, approximately 200-300 ft above my position. Realizing what had happened, I immediately cleared the takeoff area into the adjacent tie-down area. There was no conflict with aircraft convergence. Chain of events: 1) how problem arose: possible misinterp of radio transmission. 2) contributing factors: marginal radio clarity (noise and other radio xmissions). 3) how discovered: other aircraft on final 200-300 ft overhead immediate position. 4) corrective action: immediately cleared takeoff area. Human performance considerations: 1) perceptions, judgement, decisions: return aircraft to tie-down area for radio maintenance service. 2) action, inaction: hold at intersection G7 position for reclarification of transmission. 3) factors affecting quality of human performance: radio noise, frequency congestion, traffic lined up behind at intersection G7.

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Original NASA ASRS Text

Title: AN SMA PVT PLT ENTERS THE ACTIVE AT A CTLED ARPT IN THE FACE OF LNDG TFC WHILE THINKING HE HAD RECEIVED A POS AND HOLD CLRNC. FRG, NY.

Narrative: WHILE AWAITING AT INTXN G7, I CALLED ATC FOR TKOF CLRNC. ATC ADVISED THAT THE RADIO WAS UNREADABLE AND ADVISED TRYING ANOTHER RADIO. I SWITCHED TO ANOTHER RADIO AND REQUESTED A RADIO CHK. ATC ADVISED THAT IT TOO WAS POOR, BUT READABLE. THERE WERE SEVERAL OTHER XMISSIONS TAKING PLACE ALONG WITH RADIO NOISE. OTHER ACFT WERE BEHIND ME WHEN I BELIEVED TO HAVE HEARD 'TAXI INTO POS.' (INTXN G7 IS IN AN AREA WHERE ONLY TKOFS OCCUR AND IS APPROX 789 FT FROM THE LNDG THRESHOLD.) AS I DID SO, I OBSERVED A KATANA, APPROX 200-300 FT ABOVE MY POS. REALIZING WHAT HAD HAPPENED, I IMMEDIATELY CLRED THE TKOF AREA INTO THE ADJACENT TIE-DOWN AREA. THERE WAS NO CONFLICT WITH ACFT CONVERGENCE. CHAIN OF EVENTS: 1) HOW PROB AROSE: POSSIBLE MISINTERP OF RADIO XMISSION. 2) CONTRIBUTING FACTORS: MARGINAL RADIO CLARITY (NOISE AND OTHER RADIO XMISSIONS). 3) HOW DISCOVERED: OTHER ACFT ON FINAL 200-300 FT OVERHEAD IMMEDIATE POS. 4) CORRECTIVE ACTION: IMMEDIATELY CLRED TKOF AREA. HUMAN PERFORMANCE CONSIDERATIONS: 1) PERCEPTIONS, JUDGEMENT, DECISIONS: RETURN ACFT TO TIE-DOWN AREA FOR RADIO MAINT SVC. 2) ACTION, INACTION: HOLD AT INTXN G7 POS FOR RECLARIFICATION OF XMISSION. 3) FACTORS AFFECTING QUALITY OF HUMAN PERFORMANCE: RADIO NOISE, FREQ CONGESTION, TFC LINED UP BEHIND AT INTXN G7.

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.