Cpr X had less than standard separation from small transport Y. System error.

Attributes
ACN	174105
Time
Date	199103
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : gfk
State Reference	ND
Altitude	msl bound lower : 1800 msl bound upper : 1800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : gfk tower : gfk tower : lwm
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
ASRS Report	174105
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 other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Inter Facility Coordination Failure Operational Error

Narrative:

Cpr X was on a visibility approach to runway 35L from the southeast. Aircraft #2 was on a visibility approach to runway 35L from the southeast. Cpr X advised he could not follow the aircraft he was sequenced to follow and requested a right 270 degree turn back to final approach. Controller approved the turn, then attempted to get approval from the IFR controling agency (approach control). Cpr X started the right turn before approval was obtained. This put cpr X and small transport Y approximately 2.5 mi apart. No evasive action was taken nor necessary. Small transport Y was turned to the left to increase sep. Factors contributing, content of para 7-30 of the 7110.65 were not followed. Also time factor involved in obtaining approval from approach control. More than 1 min had elapsed and neither approval or disapproval was received. Situation occurred and prevention: adhere to contents of para 7-30 of 7110.65.

Original NASA ASRS Text

Title: CPR X HAD LESS THAN STANDARD SEPARATION FROM SMT Y. SYSTEM ERROR.

Narrative: CPR X WAS ON A VIS APCH TO RWY 35L FROM THE SE. ACFT #2 WAS ON A VIS APCH TO RWY 35L FROM THE SE. CPR X ADVISED HE COULD NOT FOLLOW THE ACFT HE WAS SEQUENCED TO FOLLOW AND REQUESTED A R 270 DEG TURN BACK TO FINAL APCH. CTLR APPROVED THE TURN, THEN ATTEMPTED TO GET APPROVAL FROM THE IFR CTLING AGENCY (APCH CTL). CPR X STARTED THE R TURN BEFORE APPROVAL WAS OBTAINED. THIS PUT CPR X AND SMT Y APPROX 2.5 MI APART. NO EVASIVE ACTION WAS TAKEN NOR NECESSARY. SMT Y WAS TURNED TO THE L TO INCREASE SEP. FACTORS CONTRIBUTING, CONTENT OF PARA 7-30 OF THE 7110.65 WERE NOT FOLLOWED. ALSO TIME FACTOR INVOLVED IN OBTAINING APPROVAL FROM APCH CTL. MORE THAN 1 MIN HAD ELAPSED AND NEITHER APPROVAL OR DISAPPROVAL WAS RECEIVED. SITUATION OCCURRED AND PREVENTION: ADHERE TO CONTENTS OF PARA 7-30 OF 7110.65.

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.