The pilot of a high performance single engine aircraft reported a near midair collision with an expe...

Narrative:

I departed on a flight to ojc. [On] kansas city approach [I] started a VFR descent into ojc at about 150 KIAS. At approximately 4;000 ft MSL and 10 NM west of ojc [I was] on the 250 radial traveling direct to ojc heading 070. The airplane was on autopilot. I saw in my peripheral [vision] a yellow aircraft at my 10-11 o'clock going south; co-altitude on collision bearing. I had to take aggressive action unloading the aircraft and the yellow aircraft went directly over us at no more than 500 ft; and I would say it was more like 300 ft. I also fly F/a-18s in the military and have a lot of formation experience and know that it was closer than 500 ft. After the adrenaline wore off I called approach and they said I was their only contact. Keep in mind this was just outside the mode C veil from mci (OJC250010); and since the other aircraft was traveling south I can only assume he was just inside the mode C veil moments prior; so either he wasn't squawking mode 3C or their radar was inoperative. I also asked ojc tower if they had any contact on their radar and they said their only other contact was a pilatus 10 NM southwest of ixd.contributing factors: long flight; I was focused on the approach and landing; not having the best visual lookout. I'm not sure I would have seen the airplane had it not been painted bright yellow. Having had a couple very close passes flying F/a-18's; I truly believe my wife; daughter; two dogs and I would have collided with that aircraft if I had not kicked off autopilot and unloaded at the last second. Get better radar in the terminal area of kansas city. This is not the first time I've had a close pass with another aircraft in almost the same spot. I find it totally unacceptable that 33 NM from mci at 4;000 ft two aircraft almost collided and approach didn't see anything.

Original NASA ASRS Text

Title: The pilot of a high performance single engine aircraft reported a NMAC with an experimental on approach to OJC. ATC reported they were not in contact with any other aircraft in the area.

Narrative: I departed on a flight to OJC. [On] Kansas City Approach [I] started a VFR descent into OJC at about 150 KIAS. At approximately 4;000 FT MSL and 10 NM west of OJC [I was] on the 250 radial traveling direct to OJC heading 070. The airplane was on autopilot. I saw in my peripheral [vision] a yellow aircraft at my 10-11 o'clock going south; co-altitude on collision bearing. I had to take aggressive action unloading the aircraft and the yellow aircraft went directly over us at no more than 500 FT; and I would say it was more like 300 FT. I also fly F/A-18s in the military and have a lot of formation experience and know that it was closer than 500 FT. After the adrenaline wore off I called Approach and they said I was their only contact. Keep in mind this was JUST outside the Mode C veil from MCI (OJC250010); and since the other aircraft was traveling south I can only assume he was just inside the Mode C veil moments prior; so either he wasn't squawking Mode 3C or their radar was inoperative. I also asked OJC Tower if they had any contact on their radar and they said their only other contact was a Pilatus 10 NM southwest of IXD.Contributing factors: long flight; I was focused on the approach and landing; not having the best visual lookout. I'm not sure I would have seen the airplane had it not been painted bright yellow. Having had a couple very close passes flying F/A-18's; I truly believe my wife; daughter; two dogs and I would have collided with that aircraft if I had not kicked off autopilot and unloaded at the last second. Get better radar in the terminal area of Kansas City. This is not the first time I've had a close pass with another aircraft in almost the same spot. I find it totally unacceptable that 33 NM from MCI at 4;000 FT two aircraft almost collided and approach didn't see anything.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1004029
Time
Date	201204
Local Time Of Day	0001-0600
Place
Locale Reference	OJC.Airport
State Reference	MO
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft Low Wing 1 Eng Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Visual Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Instrument Flight Crew Private
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 1200 Flight Crew Type 800
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 0 Vertical 300

The pilot of a high performance single engine aircraft reported a near midair collision with an experimental on approach to ojc. ATC reported they were not in contact with any other aircraft in the area.