Narrative:

I announce my departure from runway 17 and start my takeoff roll. Just as I rotate; I hear someone new call in; 'leesburg traffic; leesburg traffic; flight check...blah; blah; blah...' my first thought was that someone was on the approach to runway 17; which meant they were behind me; so I didn't give it my full attention; hence the 'blah; blah; blah.' during the transmission; I caught the '...VOR alpha...' and wondered what approach that was. The transmission ended with '...anyone in the area; please advise; anyone in the area; please advise!' this annoyed me as my assumption was that no monitoring of the CTAF had occurred before blowing into a non-twred airport space. The other planes in the pattern gave position reports; but I had just rotated; was establishing my climb and cleaning up the airplane. I still assumed that the airplane was behind me; and when I would eventually give my crosswind report; that would be sufficient; but it is still nagging me about the VOR-a approach. At about 350 ft AGL; I raised my takeoff flaps. My habit is to look at the flaps to confirm they're up. As I looked out; a king air passes below me 50-75 ft in the opposite direction. Now it clicks that the VOR-a is for runway 35 off the armel VOR at dulles; and I had just used up one of my lives. Shortly after we pass; the king calls a miss (he's probably below the missed approach altitude). I found out later that when he went back to approach; his only comment was that there was too much traffic at leesburg to land. I don't know if he ever saw me.

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Original NASA ASRS Text

Title: TRINIDAD TB20 PLT HAS AN NMAC DEPARTING JYO.

Narrative: I ANNOUNCE MY DEP FROM RWY 17 AND START MY TKOF ROLL. JUST AS I ROTATE; I HEAR SOMEONE NEW CALL IN; 'LEESBURG TFC; LEESBURG TFC; FLT CHK...BLAH; BLAH; BLAH...' MY FIRST THOUGHT WAS THAT SOMEONE WAS ON THE APCH TO RWY 17; WHICH MEANT THEY WERE BEHIND ME; SO I DIDN'T GIVE IT MY FULL ATTN; HENCE THE 'BLAH; BLAH; BLAH.' DURING THE XMISSION; I CAUGHT THE '...VOR ALPHA...' AND WONDERED WHAT APCH THAT WAS. THE XMISSION ENDED WITH '...ANYONE IN THE AREA; PLEASE ADVISE; ANYONE IN THE AREA; PLEASE ADVISE!' THIS ANNOYED ME AS MY ASSUMPTION WAS THAT NO MONITORING OF THE CTAF HAD OCCURRED BEFORE BLOWING INTO A NON-TWRED ARPT SPACE. THE OTHER PLANES IN THE PATTERN GAVE POS RPTS; BUT I HAD JUST ROTATED; WAS ESTABLISHING MY CLB AND CLEANING UP THE AIRPLANE. I STILL ASSUMED THAT THE AIRPLANE WAS BEHIND ME; AND WHEN I WOULD EVENTUALLY GIVE MY XWIND RPT; THAT WOULD BE SUFFICIENT; BUT IT IS STILL NAGGING ME ABOUT THE VOR-A APCH. AT ABOUT 350 FT AGL; I RAISED MY TKOF FLAPS. MY HABIT IS TO LOOK AT THE FLAPS TO CONFIRM THEY'RE UP. AS I LOOKED OUT; A KING AIR PASSES BELOW ME 50-75 FT IN THE OPPOSITE DIRECTION. NOW IT CLICKS THAT THE VOR-A IS FOR RWY 35 OFF THE ARMEL VOR AT DULLES; AND I HAD JUST USED UP ONE OF MY LIVES. SHORTLY AFTER WE PASS; THE KING CALLS A MISS (HE'S PROBABLY BELOW THE MISSED APCH ALT). I FOUND OUT LATER THAT WHEN HE WENT BACK TO APCH; HIS ONLY COMMENT WAS THAT THERE WAS TOO MUCH TFC AT LEESBURG TO LAND. I DON'T KNOW IF HE EVER SAW ME.

Data retrieved from NASA's ASRS site as of January 2009 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.