Air carrier Y had less than standard radar separation from cpr X on IFR approach. System error.

Attributes
ACN	282885
Time
Date	199409
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : gfk
State Reference	ND
Altitude	msl bound lower : 2300 msl bound upper : 2300
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : gfk tower : gfk tower : ord
Operator	general aviation : corporate
Make Model Name	Citation I/SP
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Beech 1900
Operating Under FAR Part	Part 135
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Experience	controller non radar : 10 controller radar : 2
ASRS Report	282885
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Cpr X a C501 on the ILS at 3 DME altitude 1800 ft MSL speed 110 KTS. Air carrier Y BE02 on the ILS at 5 DME altitude 2300 ft MSL speed 140 KTS. The above was at the same time. Cpr X landed and came to a stop just past runway 26 centerline and was able to turn off the runway with no delay. Just as cpr X cleared the runway the BEO2 crossed the threshold. Obviously the RAPCON at gfk knows nothing about speed control.

Original NASA ASRS Text

Title: ACR Y HAD LESS THAN STANDARD RADAR SEPARATION FROM CPR X ON IFR APCH. SYS ERROR.

Narrative: CPR X A C501 ON THE ILS AT 3 DME ALT 1800 FT MSL SPD 110 KTS. ACR Y BE02 ON THE ILS AT 5 DME ALT 2300 FT MSL SPD 140 KTS. THE ABOVE WAS AT THE SAME TIME. CPR X LANDED AND CAME TO A STOP JUST PAST RWY 26 CTRLINE AND WAS ABLE TO TURN OFF THE RWY WITH NO DELAY. JUST AS CPR X CLRED THE RWY THE BEO2 CROSSED THE THRESHOLD. OBVIOUSLY THE RAPCON AT GFK KNOWS NOTHING ABOUT SPD CTL.

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.