NMAC BETWEEN ACR LGT DESCENDING AND GA SMA CRUISING.

Narrative

BALTIMORE APCH WAS UNABLE TO HAND ME OFF TO DULLES APCH. I WAS TOLD TO CONTACT THEM ON A DISCRETE FREQ. I WAS VFR; FILED AS SUCH; AT 8500' ENRTE TO W 66 AND ABOUT 20 MI NE WHEN I WAS ABLE TO BREAK IN TO PASS MY POS AND REQUESTED FLT FOLLOWING AND CLRNC. I WAS TOLD TO SQUAWK 1200 AND TO STAND BY. AFTER ABOUT 3 MINS; I AGAIN CALLED AND WAS AGAIN TOLD TO STAND BY. I SAW A LARGE PAX JET AT 2 O'CLOCK HIGH AND APPROX 6 MI. I TOLD MY WIFE TO KEEP AN EYE ON HIM AS HE WAS IN A DSCNT AND ON A CONSTANT BEARING WITH US. I CONTINUED; NOT WANTING TO VACATE 8500' TO GO DOWN UNTIL CLRED. WHEN IT WAS APPARENT THAT A COLLISION WOULD OCCUR; I DSNDED TO 8000'AND PASSED JUST IN FRONT OF THE JET. I DO NOT THINK THAT HE EVER SAW ME. I WAS THEN (WITHIN 10 SEC OF PASSING JET) CONTACTED BY APCH AND ASKED IF I WAS STILL UP THE FREQ. HE THEN GAVE ME A SQUAWK AND A FREQ CHANGE. BEFORE CHANGING FREQS; I ASKED IF HE WAS AWARE THAT I HAD DSNDED 500' TO AVOID A COLLISION WITH A PAX JET. HE SAID THAT MY DSCNT WAS OBSERVED AND SAID THAT HE HAD INTENDED TO GIVE ME A FREQ SHIFT BUT HAD FORGOTTEN. I SWITCHED FREQS AND WAS CLRED TO DSND. THE REMAINDER OF THE FLT WAS UNREMARKABLE. I WAS SQUAWKING MODE C. I AM NOT SURE IN MY MIND THAT THE CTLR EVEN NOW RECOGNIZES HOW CLOSE WE CAME TO THE PAX JET AND THAT IF I HAD DONE NOTHING OR HAD NOT SEEN THE JET; A COLLISION WOULD HAVE OCCURRED. THE CONTRIBUTING FACTORS OR PRIMARY CAUSES OF THIS NEAR MISS WERE THE CTLRS BEING TOO BUSY; MY NOT BEING ABLE TO BREAK INTO THE FLOW OF XMISSIONS AND MY RELUCTANCE TO DSND INTO APCH'S AIRSPACE OR TO CLB INTO A DSNDING JET W/O A CLRNC. THIS WHOLE SEQUENCE OF EVENTS TOOK LESS THAN 90 SEC AND THE JET WAS LEVEL TO BELOW ME ALMOST IMMEDIATELY AFTER PASSING BEHIND ME. I KNOW HE WAS ON THE SAME FREQ AS ME; BECAUSE HE TURNED LEFT WHEN THE CTLR TOLD HIM TO ABOUT 30 SEC AFTER PASSING ME. AT NO TIME DID I FEEL THAT A TURN INTO THE JET WAS A BETTER SOLUTION BECAUSE OF HIS CLOSURE RATE WITH ME.