Narrative:

Our clearance to ric was to fly the arsenal one departure to csn and expect our normal routing to ric. While on the ground, tower gave us 2 targets that had taken off from runway 34L. We departed runway 34R from hef and were climbing through 800 ft en route to 2000 ft. We were then given a heading of 270 degrees and told to change frequency to potomac departure. When we checked in with potomac, the controller gave us a TA, 'cessna at 11 O'clock position, 1700 ft climbing, 1/2 mi.' the controller's advisory was in a matter-of-fact voice. He did not seem in the least bit concerned. At that time we were leveling at 2000 ft. I saw the cessna in a few seconds out the left vent window as we were passing over it. We probably passed over it by about 200 ft. I made no maneuvers with the aircraft on the call, because I had no idea which way to turn. Our aircraft is not equipped with any form of TCASII. The controller did not make further mention of the traffic, nor did we. I realize that people make mistakes, but coordination between manassas tower and potomac departure should be addressed. Because of instances like this, we hope to have all of our aircraft equipped with TCASII soon.

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Original NASA ASRS Text

Title: NMAC BTWN A DEP, CLBING VECTORED IFR BE20 OVERTAKING A CLBING VFR C172 THAT HAD DEPARTED FROM THE SAME ARPT, HEF, VA.

Narrative: OUR CLRNC TO RIC WAS TO FLY THE ARSENAL ONE DEP TO CSN AND EXPECT OUR NORMAL ROUTING TO RIC. WHILE ON THE GND, TWR GAVE US 2 TARGETS THAT HAD TAKEN OFF FROM RWY 34L. WE DEPARTED RWY 34R FROM HEF AND WERE CLBING THROUGH 800 FT ENRTE TO 2000 FT. WE WERE THEN GIVEN A HEADING OF 270 DEGS AND TOLD TO CHANGE FREQ TO POTOMAC DEP. WHEN WE CHKED IN WITH POTOMAC, THE CTLR GAVE US A TA, 'CESSNA AT 11 O'CLOCK POS, 1700 FT CLBING, 1/2 MI.' THE CTLR'S ADVISORY WAS IN A MATTER-OF-FACT VOICE. HE DID NOT SEEM IN THE LEAST BIT CONCERNED. AT THAT TIME WE WERE LEVELING AT 2000 FT. I SAW THE CESSNA IN A FEW SECONDS OUT THE L VENT WINDOW AS WE WERE PASSING OVER IT. WE PROBABLY PASSED OVER IT BY ABOUT 200 FT. I MADE NO MANEUVERS WITH THE ACFT ON THE CALL, BECAUSE I HAD NO IDEA WHICH WAY TO TURN. OUR ACFT IS NOT EQUIPPED WITH ANY FORM OF TCASII. THE CTLR DID NOT MAKE FURTHER MENTION OF THE TFC, NOR DID WE. I REALIZE THAT PEOPLE MAKE MISTAKES, BUT COORD BTWN MANASSAS TWR AND POTOMAC DEP SHOULD BE ADDRESSED. BECAUSE OF INSTANCES LIKE THIS, WE HOPE TO HAVE ALL OF OUR ACFT EQUIPPED WITH TCASII SOON.

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.