Oceanic controller had less than standard separation on atlantic track between two mlt aircraft.

Attributes
ACN	165242
Time
Date	199012
Day	Thu
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : yhz
State Reference	NS
Altitude	msl bound lower : 34000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zny
Operator	other
Make Model Name	Military Transport
Flight Phase	descent other
Route In Use	enroute : other oceanic enroute : atlantic
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Military Transport
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : atlantic enroute : other oceanic
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : non radar
Qualification	controller : non radar controller : developmental
Experience	controller non radar : 2
ASRS Report	165242
Person 2
Affiliation	government : military
Function	flight crew : captain oversight : pic
Qualification	pilot : military
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera other flight crewa
Resolutory Action	other
Consequence	Other
Miss Distance	horizontal : 18000 vertical : 1000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Mlt X and mlt Y were westbound in north atlantic. Mlt Y progressed 50 west at FL310 requesting FL350, mlt X was already at FL350. Mlt Y was climbed to FL350. Upon reaching FL350, I noticed he was in confliction with mlt X. I immediately descended mlt X to FL330. Mlt Y then reported sighting overtaking an aircraft abeam him at 3 mi. Later message said that when mlt X reported level at FL330, at same time mlt Y reported the sighting.

Original NASA ASRS Text

Title: OCEANIC CTLR HAD LESS THAN STANDARD SEPARATION ON ATLANTIC TRACK BETWEEN TWO MLT ACFT.

Narrative: MLT X AND MLT Y WERE WBND IN N ATLANTIC. MLT Y PROGRESSED 50 W AT FL310 REQUESTING FL350, MLT X WAS ALREADY AT FL350. MLT Y WAS CLBED TO FL350. UPON REACHING FL350, I NOTICED HE WAS IN CONFLICTION WITH MLT X. I IMMEDIATELY DSNDED MLT X TO FL330. MLT Y THEN RPTED SIGHTING OVERTAKING AN ACFT ABEAM HIM AT 3 MI. LATER MESSAGE SAID THAT WHEN MLT X RPTED LEVEL AT FL330, AT SAME TIME MLT Y RPTED THE SIGHTING.

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.