Less than standard separation over the atlantic. Operational error.

Attributes
ACN	300375
Time
Date	199503
Day	Thu
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : zin
State Reference	FO
Altitude	msl bound lower : 38000 msl bound upper : 39000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zma
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other cruise other
Route In Use	enroute : other oceanic enroute : atlantic
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute : atlantic enroute : other oceanic
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 6
ASRS Report	300375
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	300370
Events
Anomaly	conflict : airborne less severe non adherence : far non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft Y sebound to tnca. Air carrier X nwbound to acmee intersection. Both aircraft at FL390. X and Y in close proximity. X responded to a TCASII RA and descended to avoid Y. Aircraft were thought to be laterally separated, but were not. Supplemental information from acn 300370: our position about 20 mi south of acmee intersection. I had a meal tray in my lap at the time I noted the traffic at 12 O'clock, 100 ft above, about 5 mi opposite direction. The conflict cleared at FL380. The traffic passed above and to the north of our track about 2 mi. ATC was unable to contact the traffic during the event. A supervisor came on the radio.

Original NASA ASRS Text

Title: LTSS OVER THE ATLANTIC. OPERROR.

Narrative: ACFT Y SEBOUND TO TNCA. ACR X NWBOUND TO ACMEE INTXN. BOTH ACFT AT FL390. X AND Y IN CLOSE PROX. X RESPONDED TO A TCASII RA AND DSNDED TO AVOID Y. ACFT WERE THOUGHT TO BE LATERALLY SEPARATED, BUT WERE NOT. SUPPLEMENTAL INFO FROM ACN 300370: OUR POS ABOUT 20 MI S OF ACMEE INTXN. I HAD A MEAL TRAY IN MY LAP AT THE TIME I NOTED THE TFC AT 12 O'CLOCK, 100 FT ABOVE, ABOUT 5 MI OPPOSITE DIRECTION. THE CONFLICT CLRED AT FL380. THE TFC PASSED ABOVE AND TO THE N OF OUR TRACK ABOUT 2 MI. ATC WAS UNABLE TO CONTACT THE TFC DURING THE EVENT. A SUPVR CAME ON THE RADIO.

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.