Narrative:

On the afternoon of oct/xa/95 I was flying T34 nxxxx on a VFR flight from NAS willow grove, PA, to langley AFB, va. At about XA30 local time I was flying sbound along the east shore of the chesapeake bay about 3 mi north of the town of rock hall, md, at about 1500 ft MSL when I noticed a twin-engine propeller aircraft about a mi ahead of my nose, traveling northbound, directly toward me at the same altitude. I began a right turn to avoid the conflict, rolling out at about 270 degree heading. At that time the twin entered a left turn which brought it on a collision course again. I rocked my wings to make my aircraft more visible, but the twin continued to close rapidly. I went to full power and climbed 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 left bank. I then descended back to 1500 ft MSL and returned to the shoreline, resuming my southerly heading. The cessna 340 continued its left turn, and rolled out on a heading which again set up a collision course, rapidly approaching from my 4 O'clock. I again rocked my wings to ensure that he saw my aircraft, but the cessna continued to close rapidly. I then executed a descent to avoid a collision, and the cessna passed overhead about 200 ft above and slightly behind my aircraft. At this time I was able to read the tail number of the cessna. The cessna 340 then executed a left turn and proceeded to the northwest. The WX was clear, dry, VMC with over 10 mi of visibility, and my aircraft is bright yellow, very difficult to miss at such close range!! Callback conversation with reporter revealed the following information: the reporter stated that he ran the cessna 340 north number through FSDO. There was no such number in the database. The reporter did not know about the chesterfield city parachute drop zone, but, said he flew along the east side of the chesapeake bay shoreline which is close to the parachute drop zone. The T34 is a mint condition attractive T34. The reporter thought maybe the C340 on this nice day was just flying around and decided to take a look at it. The reporter on second thought indicated the behavior of the aircraft was not to come alongside and look, but more an aggressive interdiction or attack. The reporter is an aviation safety officer with the military.

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Original NASA ASRS Text

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

Narrative: 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.

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.