Narrative:

After start and pre taxi checklist complete, I heard an aircraft call for advisories on unicom. The response was 'winds favor runway 13.' the pilot of the requesting aircraft then replied 'I'll set up for runway 13, I'm about 5 mi east.' I began taxiing for runway 36 as it was a shorter taxi route. I felt the winds were calm, and I felt confident I could be airborne prior to the other's arrival. After I completed my run-up, I announced that I was departing runway 36. I had heard nothing from the other aircraft and was certain I was departing well in advance of the arrival aircraft. As I was approaching takeoff speed, I saw the arrival aircraft on very short final to runway 13. I used short field takeoff procedures to clear the intersection with as much altitude as I could. Later in my flight, while trying to contact gulfport approach, I learned that my microphone was not transmitting, only the sidetone in my headset was normal. I assume my departure call was never heard by the arrival aircraft, or that pilot would certainly have questioned it or have adjusted his approach to runway 13. 3 items are worth noting: 1) what sounds like a normal transmission in one's headset may not be a normal transmission externally. My microphone was good just 1 hour earlier. 2) to taxi to a runway different from what is responded to as the favored runway by unicom is probably not the best decision. 3) 'downwind,' 'base,' and 'final' calls would have prevented my departure at the time I chose, and although the conflict was not a severe one, it could have been had I been 30 seconds or so later on my takeoff roll.

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Original NASA ASRS Text

Title: POTENTIAL CONFLICT BY 2 SMA'S AT A NON TWR ARPT. RPTR'S ACFT LOST XMITTING CAPABILITY AND THAT FACT WAS NOT DISCOVERED UNTIL AFTER DEP.

Narrative: AFTER START AND PRE TAXI CHKLIST COMPLETE, I HEARD AN ACFT CALL FOR ADVISORIES ON UNICOM. THE RESPONSE WAS 'WINDS FAVOR RWY 13.' THE PLT OF THE REQUESTING ACFT THEN REPLIED 'I'LL SET UP FOR RWY 13, I'M ABOUT 5 MI E.' I BEGAN TAXIING FOR RWY 36 AS IT WAS A SHORTER TAXI RTE. I FELT THE WINDS WERE CALM, AND I FELT CONFIDENT I COULD BE AIRBORNE PRIOR TO THE OTHER'S ARR. AFTER I COMPLETED MY RUN-UP, I ANNOUNCED THAT I WAS DEPARTING RWY 36. I HAD HEARD NOTHING FROM THE OTHER ACFT AND WAS CERTAIN I WAS DEPARTING WELL IN ADVANCE OF THE ARR ACFT. AS I WAS APCHING TKOF SPD, I SAW THE ARR ACFT ON VERY SHORT FINAL TO RWY 13. I USED SHORT FIELD TKOF PROCS TO CLR THE INTXN WITH AS MUCH ALT AS I COULD. LATER IN MY FLT, WHILE TRYING TO CONTACT GULFPORT APCH, I LEARNED THAT MY MIKE WAS NOT TRANSMITTING, ONLY THE SIDETONE IN MY HEADSET WAS NORMAL. I ASSUME MY DEP CALL WAS NEVER HEARD BY THE ARR ACFT, OR THAT PLT WOULD CERTAINLY HAVE QUESTIONED IT OR HAVE ADJUSTED HIS APCH TO RWY 13. 3 ITEMS ARE WORTH NOTING: 1) WHAT SOUNDS LIKE A NORMAL XMISSION IN ONE'S HEADSET MAY NOT BE A NORMAL XMISSION EXTERNALLY. MY MIKE WAS GOOD JUST 1 HR EARLIER. 2) TO TAXI TO A RWY DIFFERENT FROM WHAT IS RESPONDED TO AS THE FAVORED RWY BY UNICOM IS PROBABLY NOT THE BEST DECISION. 3) 'DOWNWIND,' 'BASE,' AND 'FINAL' CALLS WOULD HAVE PREVENTED MY DEP AT THE TIME I CHOSE, AND ALTHOUGH THE CONFLICT WAS NOT A SEVERE ONE, IT COULD HAVE BEEN HAD I BEEN 30 SECONDS OR SO LATER ON MY TKOF ROLL.

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.