Air carrier ATR-42 had less than standard separation from king air same altitude assigned.

Attributes
ACN	269612
Time
Date	199404
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : hvn
State Reference	CT
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90 tower : msp
Operator	common carrier : air carrier
Make Model Name	ATR 42
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Super King Air 200/Huron
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 3
ASRS Report	269612
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 8400 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was working 2 aircraft and lost separation. Callback conversation with reporter revealed the following information: reporter stated types of aircraft were air carrier ATR and cpr king air. Reporter had just relieved the position from a trainee. Traffic was complex. Both aircraft on vectors pointed at each other. Reporter admitted forgetting king air. Conflict alert did not activate. Reporter descended air carrier but too late. Separation was 1.4 mi. Operational error filed by facility. Reporter was only on position for a total of 3 mins.

Original NASA ASRS Text

Title: ACR ATR-42 HAD LTSS FROM KING AIR SAME ALT ASSIGNED.

Narrative: I WAS WORKING 2 ACFT AND LOST SEPARATION. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED TYPES OF ACFT WERE ACR ATR AND CPR KING AIR. RPTR HAD JUST RELIEVED THE POS FROM A TRAINEE. TFC WAS COMPLEX. BOTH ACFT ON VECTORS POINTED AT EACH OTHER. RPTR ADMITTED FORGETTING KING AIR. CONFLICT ALERT DID NOT ACTIVATE. RPTR DSNDED ACR BUT TOO LATE. SEPARATION WAS 1.4 MI. OPERROR FILED BY FACILITY. RPTR WAS ONLY ON POS FOR A TOTAL OF 3 MINS.

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.