Military aircraft making na IFR approach reported a near midair collision with an unknown aircraft.

Attributes
ACN	130344
Time
Date	198912
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sjt
State Reference	TX
Altitude	msl bound lower : 6200 msl bound upper : 6500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sjt tower : pao
Operator	other
Make Model Name	Military Trainer
Flight Phase	descent other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : non radar
Experience	controller military : 6 controller non radar : 7
ASRS Report	130344
Person 2
Affiliation	government : military
Function	flight crew : captain oversight : pic
Qualification	pilot : military
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 500 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was working sjt approach control. I cleared MTR X for the high ILS approach. MTR X reported out of 8000' on the approach. MTR X advised me of a near midair with a VFR small aircraft at 6500' MSL. The small aircraft was not talking to me or to sjt tower. As it often happens, the light aircraft was unknown traffic. Sjt is one of, if not the busiest non radar approach controllers in the us, and this happens almost daily. West/O radar it will continue to happen until 2 aircraft do run together.

Original NASA ASRS Text

Title: MIL ACFT MAKING NA IFR APCH REPORTED A NMAC WITH AN UNKNOWN ACFT.

Narrative: I WAS WORKING SJT APCH CTL. I CLRED MTR X FOR THE HIGH ILS APCH. MTR X RPTED OUT OF 8000' ON THE APCH. MTR X ADVISED ME OF A NEAR MIDAIR WITH A VFR SMA AT 6500' MSL. THE SMA WAS NOT TALKING TO ME OR TO SJT TWR. AS IT OFTEN HAPPENS, THE LIGHT ACFT WAS UNKNOWN TFC. SJT IS ONE OF, IF NOT THE BUSIEST NON RADAR APCH CTLRS IN THE U.S., AND THIS HAPPENS ALMOST DAILY. W/O RADAR IT WILL CONTINUE TO HAPPEN UNTIL 2 ACFT DO RUN TOGETHER.

Data retrieved from NASA's ASRS site as of August 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.