Narrative:

I was flying on an IFR flight plan from dts to jka at 6000 ft MSL and a 280 degree heading assigned by eglin AFB radar facility. I was told to contact pns approach and after establishing contact with pns, was assigned a 270 degree heading. I was watching a navy T34 trainer performing aerobatics at about my 1 O'clock position and approximately 2 mi distance. The navy aircraft was climbing and descending through my altitude. Pns approach never issued a TA for this aircraft. The navy T34 began a steep descent from above my altitude to approximately 1000 ft below my aircraft then commenced to climb steeply, which brought him approximately 500 ft above my aircraft. The pilot of the navy aircraft would not have been able to see my aircraft at this time due to the attitude and position of his aircraft. The navy trainer was now at my 12 O'clock position and approximately 500 ft above and approximately 1000 ft horizontal from my aircraft and in a near vertical attitude. The navy aircraft began a wing over type maneuver to the right (south) at the top of his climb, and at this time I took evasive action to avoid this aircraft. My evasive action consisted of a turn sharply to the left (south) and a descent in order to maintain visual contact with the navy trainer. During this evasive action, I informed pns approach that I was deviating due to traffic conflict. I arrested the turn on a 180 degree heading and stopped the descent at 6600 ft MSL. Pns approach then informed me of additional traffic at my 12 O'clock position and also informed me of the aircraft I had just avoided and that he was squawking an aerobatic code. After safely clearing this traffic, I informed pns approach that I was returning to my assigned heading of 270 degrees. I also began a climb back to my assigned altitude of 6000 ft MSL. This event occurred along the airspace boundaries of pns, fl, and eglin AFB sua east/west corridor which consists of a high volume of civilian and military traffic.

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Original NASA ASRS Text

Title: PLT IN A C90 ACFT IFR ENRTE FROM DTS TO JKA IS REQUIRED TO TAKE EVASIVE ACTION WHEN A NAVY T34 TRAINER PERFORMS AEROBATICS AT HIS ALT AND RTE OF FLT.

Narrative: I WAS FLYING ON AN IFR FLT PLAN FROM DTS TO JKA AT 6000 FT MSL AND A 280 DEG HDG ASSIGNED BY EGLIN AFB RADAR FACILITY. I WAS TOLD TO CONTACT PNS APCH AND AFTER ESTABLISHING CONTACT WITH PNS, WAS ASSIGNED A 270 DEG HDG. I WAS WATCHING A NAVY T34 TRAINER PERFORMING AEROBATICS AT ABOUT MY 1 O'CLOCK POS AND APPROX 2 MI DISTANCE. THE NAVY ACFT WAS CLBING AND DSNDING THROUGH MY ALT. PNS APCH NEVER ISSUED A TA FOR THIS ACFT. THE NAVY T34 BEGAN A STEEP DSCNT FROM ABOVE MY ALT TO APPROX 1000 FT BELOW MY ACFT THEN COMMENCED TO CLB STEEPLY, WHICH BROUGHT HIM APPROX 500 FT ABOVE MY ACFT. THE PLT OF THE NAVY ACFT WOULD NOT HAVE BEEN ABLE TO SEE MY ACFT AT THIS TIME DUE TO THE ATTITUDE AND POS OF HIS ACFT. THE NAVY TRAINER WAS NOW AT MY 12 O'CLOCK POS AND APPROX 500 FT ABOVE AND APPROX 1000 FT HORIZ FROM MY ACFT AND IN A NEAR VERT ATTITUDE. THE NAVY ACFT BEGAN A WING OVER TYPE MANEUVER TO THE R (S) AT THE TOP OF HIS CLIMB, AND AT THIS TIME I TOOK EVASIVE ACTION TO AVOID THIS ACFT. MY EVASIVE ACTION CONSISTED OF A TURN SHARPLY TO THE L (S) AND A DSCNT IN ORDER TO MAINTAIN VISUAL CONTACT WITH THE NAVY TRAINER. DURING THIS EVASIVE ACTION, I INFORMED PNS APCH THAT I WAS DEVIATING DUE TO TFC CONFLICT. I ARRESTED THE TURN ON A 180 DEG HDG AND STOPPED THE DSCNT AT 6600 FT MSL. PNS APCH THEN INFORMED ME OF ADDITIONAL TFC AT MY 12 O'CLOCK POS AND ALSO INFORMED ME OF THE ACFT I HAD JUST AVOIDED AND THAT HE WAS SQUAWKING AN AEROBATIC CODE. AFTER SAFELY CLRING THIS TFC, I INFORMED PNS APCH THAT I WAS RETURNING TO MY ASSIGNED HDG OF 270 DEGS. I ALSO BEGAN A CLB BACK TO MY ASSIGNED ALT OF 6000 FT MSL. THIS EVENT OCCURRED ALONG THE AIRSPACE BOUNDARIES OF PNS, FL, AND EGLIN AFB SUA E/W CORRIDOR WHICH CONSISTS OF A HIGH VOLUME OF CIVILIAN AND MIL TFC.

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.