An unknown small aircraft crossed in front of a military aircraft on an ILS approach during IMC conditions. Reporter states near midair collision occurred.

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Attributes
ACN	159569
Time
Date	199010
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : swf
State Reference	NY
Altitude	msl bound lower : 1800 msl bound upper : 1800
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : swf tower : swf
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other
Flight Plan	None
Aircraft 2
Operator	other
Make Model Name	Military Transport
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
ASRS Report	159569
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	conflict : nmac non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Miss Distance	horizontal : 200 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

An small aircraft X probably operating out of mgj, xed 200' in front of an mlt Y on ILS. Small aircraft X probably didn't know where control zone starts, and wasn't talking to approach or tower. Mlt Y had just been turned over to tower. Approach did not see small aircraft target.

Original NASA ASRS Text

Title: AN UNKNOWN SMA CROSSED IN FRONT OF A MIL ACFT ON AN ILS APCH DURING IMC CONDITIONS. REPORTER STATES NMAC OCCURRED.

Narrative: AN SMA X PROBABLY OPERATING OUT OF MGJ, XED 200' IN FRONT OF AN MLT Y ON ILS. SMA X PROBABLY DIDN'T KNOW WHERE CTL ZONE STARTS, AND WASN'T TALKING TO APCH OR TWR. MLT Y HAD JUST BEEN TURNED OVER TO TWR. APCH DID NOT SEE SMA TARGET.

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.