Controller has less than standard separation between 2 IFR aircraft on final approach.

Attributes
ACN	200509
Time
Date	199202
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sle
State Reference	OR
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zse
Operator	other
Make Model Name	Helicopter
Flight Phase	descent : approach
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 21
ASRS Report	200509
Person 2
Affiliation	government : military
Function	flight crew : captain oversight : pic
Qualification	pilot : military
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 15000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Mlt X, a helicopter was on an ILS 31 approach to sle at 3000 ft with an approach speed of 120 KTS. Mlt X was approximately 4 mi outside of turno NDB, the OM. I was vectoring small aircraft Y to follow mlt X on a straight in NDB runway 31 approach. Small aircraft Y was also at 3000 ft MSL. Because of 4000 mia east of sle, I had to keep small aircraft Y in tight to the airport. Small aircraft Y was at reduced airspeed of 90 KTS. Mlt X had indicated that he would terminate the approach by cancelling IFR. My thought process was to use visual separation between the 2 aircraft, however, I failed to receive a cancellation from mlt X before I shipped him to tower.

Original NASA ASRS Text

Title: CTLR HAS LTSS BTWN 2 IFR ACFT ON FINAL APCH.

Narrative: MLT X, A HELI WAS ON AN ILS 31 APCH TO SLE AT 3000 FT WITH AN APCH SPD OF 120 KTS. MLT X WAS APPROX 4 MI OUTSIDE OF TURNO NDB, THE OM. I WAS VECTORING SMA Y TO FOLLOW MLT X ON A STRAIGHT IN NDB RWY 31 APCH. SMA Y WAS ALSO AT 3000 FT MSL. BECAUSE OF 4000 MIA EAST OF SLE, I HAD TO KEEP SMA Y IN TIGHT TO THE ARPT. SMA Y WAS AT REDUCED AIRSPD OF 90 KTS. MLT X HAD INDICATED THAT HE WOULD TERMINATE THE APCH BY CANCELLING IFR. MY THOUGHT PROCESS WAS TO USE VISUAL SEPARATION BTWN THE 2 ACFT, HOWEVER, I FAILED TO RECEIVE A CANCELLATION FROM MLT X BEFORE I SHIPPED HIM TO TWR.

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.