A CESSNA 340 MADE 3 OVERT PASSES AT THE RPTR WITHOUT ANY KNOWN PROVOCATION.

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ON THE AFTERNOON OF OCT/XA/95 I WAS FLYING T34 NXXXX ON A VFR FLT FROM NAS WILLOW GROVE; PA; TO LANGLEY AFB; VA. AT ABOUT XA30 LCL TIME I WAS FLYING SBOUND ALONG THE E SHORE OF THE CHESAPEAKE BAY ABOUT 3 MI N OF THE TOWN OF ROCK HALL; MD; AT ABOUT 1500 FT MSL WHEN I NOTICED A TWIN-ENG PROP ACFT ABOUT A MI AHEAD OF MY NOSE; TRAVELING NBOUND; DIRECTLY TOWARD ME AT THE SAME ALT. I BEGAN A R TURN TO AVOID THE CONFLICT; ROLLING OUT AT ABOUT 270 DEG HDG. AT THAT TIME THE TWIN ENTERED A L TURN WHICH BROUGHT IT ON A COLLISION COURSE AGAIN. I ROCKED MY WINGS TO MAKE MY ACFT MORE VISIBLE; BUT THE TWIN CONTINUED TO CLOSE RAPIDLY. I WENT TO FULL PWR AND CLBED STEEPLY TO AVOID A COLLISION; AND THE TWIN; A TAN OR CREAM COLORED CESSNA 340 PASSED ABOUT 300 FT DIRECTLY BENEATH ME IN A SLIGHT L BANK. I THEN DSNDED BACK TO 1500 FT MSL AND RETURNED TO THE SHORELINE; RESUMING MY SOUTHERLY HDG. THE CESSNA 340 CONTINUED ITS L TURN; AND ROLLED OUT ON A HDG WHICH AGAIN SET UP A COLLISION COURSE; RAPIDLY APCHING FROM MY 4 O'CLOCK. I AGAIN ROCKED MY WINGS TO ENSURE THAT HE SAW MY ACFT; BUT THE CESSNA CONTINUED TO CLOSE RAPIDLY. I THEN EXECUTED A DSCNT TO AVOID A COLLISION; AND THE CESSNA PASSED OVERHEAD ABOUT 200 FT ABOVE AND SLIGHTLY BEHIND MY ACFT. AT THIS TIME I WAS ABLE TO READ THE TAIL NUMBER OF THE CESSNA. THE CESSNA 340 THEN EXECUTED A L TURN AND PROCEEDED TO THE NW. THE WX WAS CLR; DRY; VMC WITH OVER 10 MI OF VISIBILITY; AND MY ACFT IS BRIGHT YELLOW; VERY DIFFICULT TO MISS AT SUCH CLOSE RANGE!! CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT HE RAN THE CESSNA 340 N NUMBER THROUGH FSDO. THERE WAS NO SUCH NUMBER IN THE DATABASE. THE RPTR DID NOT KNOW ABOUT THE CHESTERFIELD CITY PARACHUTE DROP ZONE; BUT; SAID HE FLEW ALONG THE E SIDE OF THE CHESAPEAKE BAY SHORELINE WHICH IS CLOSE TO THE PARACHUTE DROP ZONE. THE T34 IS A MINT CONDITION ATTRACTIVE T34. THE RPTR THOUGHT MAYBE THE C340 ON THIS NICE DAY WAS JUST FLYING AROUND AND DECIDED TO TAKE A LOOK AT IT. THE RPTR ON SECOND THOUGHT INDICATED THE BEHAVIOR OF THE ACFT WAS NOT TO COME ALONGSIDE AND LOOK; BUT MORE AN AGGRESSIVE INTERDICTION OR ATTACK. THE RPTR IS AN AVIATION SAFETY OFFICER WITH THE MIL.