Atx X had less than standard separation from military Y. System error.

Attributes
ACN	112487
Time
Date	198905
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : pix
State Reference	PA
Altitude	msl bound lower : 4000 msl bound upper : 4200
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny
Operator	common carrier : air taxi
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Helicopter
Flight Phase	cruise other descent other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 6 controller radar : 7
ASRS Report	112487
Person 2
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	faa : investigated
Miss Distance	horizontal : 21000 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Atx X instructed to execute right 360 turn. Midway thru turn, atx X cleared for ILS 27 approach. Was expected to continue turn. Atx X stopped turn and proceeded outbnd south of localizer conflicting with military Y. Callback conversation with reporter revealed the following: reporter states aircraft 1 was an atx small transport and aircraft 2 was a military mlt. Aircraft 1 was issued a 360 for spacing and started the turn over pix. Aircraft 1 was cleared for the ILS 27. No intercept heading or distance from the approach fix was issued. Aircraft 1 continued eastbound to a point 4 mi east of pix before starting turn inbound. 5 mi radar separation was lost with aircraft 2 which was inbound on the localizer for an ILS 27 approach. Facility processed as a system error.

Original NASA ASRS Text

Title: ATX X HAD LESS THAN STANDARD SEPARATION FROM MIL Y. SYSTEM ERROR.

Narrative: ATX X INSTRUCTED TO EXECUTE RIGHT 360 TURN. MIDWAY THRU TURN, ATX X CLRED FOR ILS 27 APCH. WAS EXPECTED TO CONTINUE TURN. ATX X STOPPED TURN AND PROCEEDED OUTBND S OF LOC CONFLICTING WITH MIL Y. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: REPORTER STATES ACFT 1 WAS AN ATX SMT AND ACFT 2 WAS A MIL MLT. ACFT 1 WAS ISSUED A 360 FOR SPACING AND STARTED THE TURN OVER PIX. ACFT 1 WAS CLRED FOR THE ILS 27. NO INTERCEPT HDG OR DISTANCE FROM THE APCH FIX WAS ISSUED. ACFT 1 CONTINUED EBND TO A POINT 4 MI E OF PIX BEFORE STARTING TURN INBND. 5 MI RADAR SEPARATION WAS LOST WITH ACFT 2 WHICH WAS INBND ON THE LOC FOR AN ILS 27 APCH. FAC PROCESSED AS A SYSTEM ERROR.

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.