Narrative:

Climbing out of indianapolis (about 6 mins after takeoff), we were on an assigned heading of 230 degrees, passing through 9600 ft, I noticed a single engine, low wing aircraft at our 1-2 O'clock position flying directly at us and just slightly above us. At time of sighting, the other aircraft was only 400-500 ft away. I was hand flying and immediately pushed the nose over experiencing slight negative g-force. We passed under the other aircraft at an estimated 50-100 ft. From time I spotted the aircraft until it passed above us was about 2-3 seconds. Our heading at time was 230 degrees, and other aircraft was on about a 110 degree heading. We did not see other aircraft take an evasive maneuver. The other aircraft was a single engine, propeller, low wing and conventional tail. It was mostly silver/aluminum color with a red/orange nose cowl area. It appeared to be an old military training aircraft. Our aircraft was equipped with TCASII and it was operating properly at the time. We did not see the aircraft on our TCASII display, nor did we receive an RA or TA warning. ZID did not have any aircraft on radar in our vicinity. Apparently the other aircraft did not have a transponder or it was not operating. Suggestion for non-reoccurrence of this type of situation: require all aircraft to have and use mode C transponder while in controled airspace.

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Original NASA ASRS Text

Title: NMAC.

Narrative: CLBING OUT OF INDIANAPOLIS (ABOUT 6 MINS AFTER TKOF), WE WERE ON AN ASSIGNED HDG OF 230 DEGS, PASSING THROUGH 9600 FT, I NOTICED A SINGLE ENG, LOW WING ACFT AT OUR 1-2 O'CLOCK POS FLYING DIRECTLY AT US AND JUST SLIGHTLY ABOVE US. AT TIME OF SIGHTING, THE OTHER ACFT WAS ONLY 400-500 FT AWAY. I WAS HAND FLYING AND IMMEDIATELY PUSHED THE NOSE OVER EXPERIENCING SLIGHT NEGATIVE G-FORCE. WE PASSED UNDER THE OTHER ACFT AT AN ESTIMATED 50-100 FT. FROM TIME I SPOTTED THE ACFT UNTIL IT PASSED ABOVE US WAS ABOUT 2-3 SECONDS. OUR HDG AT TIME WAS 230 DEGS, AND OTHER ACFT WAS ON ABOUT A 110 DEG HDG. WE DID NOT SEE OTHER ACFT TAKE AN EVASIVE MANEUVER. THE OTHER ACFT WAS A SINGLE ENG, PROP, LOW WING AND CONVENTIONAL TAIL. IT WAS MOSTLY SILVER/ALUMINUM COLOR WITH A RED/ORANGE NOSE COWL AREA. IT APPEARED TO BE AN OLD MIL TRAINING ACFT. OUR ACFT WAS EQUIPPED WITH TCASII AND IT WAS OPERATING PROPERLY AT THE TIME. WE DID NOT SEE THE ACFT ON OUR TCASII DISPLAY, NOR DID WE RECEIVE AN RA OR TA WARNING. ZID DID NOT HAVE ANY ACFT ON RADAR IN OUR VICINITY. APPARENTLY THE OTHER ACFT DID NOT HAVE A XPONDER OR IT WAS NOT OPERATING. SUGGESTION FOR NON-REOCCURRENCE OF THIS TYPE OF SIT: REQUIRE ALL ACFT TO HAVE AND USE MODE C XPONDER WHILE IN CTLED AIRSPACE.

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.