ARTCC radar controller lost intrail radar separation.

Attributes
ACN	182452
Time
Date	199106
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ckh airport : hnl
State Reference	HI
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : hnl
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute airway : zhn
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
ASRS Report	182452
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 28980 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

While working hnl approach, 118.3 'H' position I had 2 inbound targets/tracks to the inbound fix at terminal area boundary. Widebody transport Y was somewhere intrail of widebody transport X. Both ARTS tracks were in 'nat' (not ARTS tracked) mode and no primary target was observed. Both aircraft were on hnl cerap sector 3 (frequency 124.1). Approximately 1 mi northeast of bambo, ARTS acquired and primary target was observed on widebody transport X, level at 10000 ft. Within 30 seconds, widebody transport Y target was observed and ARTS acquisition occurred. Using a slew function, I slewed to measure distance between the 2 targets, the readout was 4.83 NM. This was less than prescribed of 5 NM. I attempted to call the sector to coordinate a turn to avoid conflict. At that point, I observed widebody transport Y in a turn to approximately 260 degree to 270 degree heading. Widebody transport Y was subsequently radar contact, changed to my frequency and landed without incident.

Original NASA ASRS Text

Title: ARTCC RADAR CTLR LOST INTRAIL RADAR SEPARATION.

Narrative: WHILE WORKING HNL APCH, 118.3 'H' POS I HAD 2 INBOUND TARGETS/TRACKS TO THE INBOUND FIX AT TERMINAL AREA BOUNDARY. WDB Y WAS SOMEWHERE INTRAIL OF WDB X. BOTH ARTS TRACKS WERE IN 'NAT' (NOT ARTS TRACKED) MODE AND NO PRIMARY TARGET WAS OBSERVED. BOTH ACFT WERE ON HNL CERAP SECTOR 3 (FREQ 124.1). APPROX 1 MI NE OF BAMBO, ARTS ACQUIRED AND PRIMARY TARGET WAS OBSERVED ON WDB X, LEVEL AT 10000 FT. WITHIN 30 SECONDS, WDB Y TARGET WAS OBSERVED AND ARTS ACQUISITION OCCURRED. USING A SLEW FUNCTION, I SLEWED TO MEASURE DISTANCE BTWN THE 2 TARGETS, THE READOUT WAS 4.83 NM. THIS WAS LESS THAN PRESCRIBED OF 5 NM. I ATTEMPTED TO CALL THE SECTOR TO COORDINATE A TURN TO AVOID CONFLICT. AT THAT POINT, I OBSERVED WDB Y IN A TURN TO APPROX 260 DEG TO 270 DEG HDG. WDB Y WAS SUBSEQUENTLY RADAR CONTACT, CHANGED TO MY FREQ AND LANDED WITHOUT INCIDENT.

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.