Narrative:

Communication with bwi departure, cleared RNAV direct mdt. Checking thunderstorms on radar around airport (40 mi away) looked up, saw blue small aircraft wbound (we were northbound) at our altitude. He/she was in a steep descent. I disconnected autoplt, turned right and brought power to idle. Other aircraft cleared us on left side and below. As I turned back on course and smoothly added power, we lost about 200' and trying not to scare passenger, as other aircraft was well clear by now. Bwi primary radar out of service (all summer, I think), even after I notified ATC, he had no target. When I called on phone to report the near midair, the man I talked to was looking over our controller's shoulder and told me that he never saw a target either. Question: what is an arsa doing without primary radar? Isn't that a contradiction in terms? NTSB would have said 'pilots failed to ...'. Aircraft go too fast nowadays for the VFR regulations. Although our visibility was 10+ miles, aircraft going 200+ KTS need more than 3 mi protection in controled airspace.

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Original NASA ASRS Text

Title: MDT ON DEP SIGHTS SMA. EVASIVE ACTION. NO TRAFFIC CALL.

Narrative: COM WITH BWI DEP, CLRED RNAV DIRECT MDT. CHECKING TSTMS ON RADAR AROUND ARPT (40 MI AWAY) LOOKED UP, SAW BLUE SMA WBOUND (WE WERE NBND) AT OUR ALT. HE/SHE WAS IN A STEEP DSCNT. I DISCONNECTED AUTOPLT, TURNED RIGHT AND BROUGHT POWER TO IDLE. OTHER ACFT CLRED US ON LEFT SIDE AND BELOW. AS I TURNED BACK ON COURSE AND SMOOTHLY ADDED POWER, WE LOST ABOUT 200' AND TRYING NOT TO SCARE PAX, AS OTHER ACFT WAS WELL CLEAR BY NOW. BWI PRIMARY RADAR OUT OF SERVICE (ALL SUMMER, I THINK), EVEN AFTER I NOTIFIED ATC, HE HAD NO TARGET. WHEN I CALLED ON PHONE TO REPORT THE NEAR MIDAIR, THE MAN I TALKED TO WAS LOOKING OVER OUR CTLR'S SHOULDER AND TOLD ME THAT HE NEVER SAW A TARGET EITHER. QUESTION: WHAT IS AN ARSA DOING WITHOUT PRIMARY RADAR? ISN'T THAT A CONTRADICTION IN TERMS? NTSB WOULD HAVE SAID 'PLTS FAILED TO ...'. ACFT GO TOO FAST NOWADAYS FOR THE VFR REGS. ALTHOUGH OUR VISIBILITY WAS 10+ MILES, ACFT GOING 200+ KTS NEED MORE THAN 3 MI PROTECTION IN CTLED AIRSPACE.

Data retrieved from NASA's ASRS site as of August 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.