Operational error occurred with the loss of separation between air carrier X and air carrier Y.

Attributes
ACN	310450
Time
Date	199507
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bet
State Reference	AK
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zan
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : other oceanic enroute : pacific
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 140 flight time total : 21000 flight time type : 1000
ASRS Report	310450
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : published procedure non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance
Consequence	Other
Miss Distance	horizontal : 18000 vertical : 0
Supplementary
Air Traffic Incident	Operational Error

Narrative:

We were in cruise at FL350 in radar contact with zan approaching intersection of R-220. Air carrier Y appeared on our right at same altitude approximately 3 mi. Air carrier Z was at our 6 O'clock position at FL330, 3 mi. Both air carrier Y and air carrier Z appeared on our TCASII but no TA or RA was noted. Zan descended air carrier Z then we descended to FL330, air carrier Y remained at FL350. If we had not been visual or in IMC the outcome may have been different.

Original NASA ASRS Text

Title: OPERROR OCCURRED WITH THE LOSS OF SEPARATION BTWN ACR X AND ACR Y.

Narrative: WE WERE IN CRUISE AT FL350 IN RADAR CONTACT WITH ZAN APCHING INTXN OF R-220. ACR Y APPEARED ON OUR R AT SAME ALT APPROX 3 MI. ACR Z WAS AT OUR 6 O'CLOCK POS AT FL330, 3 MI. BOTH ACR Y AND ACR Z APPEARED ON OUR TCASII BUT NO TA OR RA WAS NOTED. ZAN DSNDED ACR Z THEN WE DSNDED TO FL330, ACR Y REMAINED AT FL350. IF WE HAD NOT BEEN VISUAL OR IN IMC THE OUTCOME MAY HAVE BEEN DIFFERENT.

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.