Less than standard separation between 2 air carrier aircraft. Operational error.

Attributes
ACN	80901
Time
Date	198801
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : hqm
State Reference	WA
Altitude	msl bound lower : 37000 msl bound upper : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
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 : pacific enroute : other oceanic enroute other
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
Route In Use	enroute : other oceanic enroute : pacific enroute other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 7000 flight time type : 1000
ASRS Report	80901
Person 2
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : became reoriented
Miss Distance	horizontal : 4500 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We were clrd from middleton island to robby intersection on B453 at FL370. At all times we were on course, within our estimated times and at FL370. While descending for a landing at oak, oak center asked us to call them when we were on the ground. When we did, they informed us that the pilot of air carrier Y had reported a near miss of 3/4 mi at FL370 in the vicinity of sedar intersection. We checked our time over robby intersection and by estimating back we determined that we were abeam sedar intersection at FL370 at the time of the near miss. We never saw or felt the other aircraft. ATC would not reveal any other information it is hard to speculate on any possible causes of this incident. Cbc conversation with reporter revealed the following: reporter was copilot and after landing the call to ZOA was by PIC. Air carrier Y was inbound to seattle/vancouver area on crossing course. Reporter has heard nothing further reference the incident. PIC had said he was not going to pursue it other than a report to his company chief pilot. Flight crew of X did not see air carrier Y.

Original NASA ASRS Text

Title: LESS THAN STANDARD SEPARATION BETWEEN 2 ACR ACFT. OPERATIONAL ERROR.

Narrative: WE WERE CLRD FROM MIDDLETON ISLAND TO ROBBY INTXN ON B453 AT FL370. AT ALL TIMES WE WERE ON COURSE, WITHIN OUR ESTIMATED TIMES AND AT FL370. WHILE DSNDING FOR A LNDG AT OAK, OAK CENTER ASKED US TO CALL THEM WHEN WE WERE ON THE GND. WHEN WE DID, THEY INFORMED US THAT THE PLT OF ACR Y HAD RPTED A NEAR MISS OF 3/4 MI AT FL370 IN THE VICINITY OF SEDAR INTXN. WE CHKED OUR TIME OVER ROBBY INTXN AND BY ESTIMATING BACK WE DETERMINED THAT WE WERE ABEAM SEDAR INTXN AT FL370 AT THE TIME OF THE NEAR MISS. WE NEVER SAW OR FELT THE OTHER ACFT. ATC WOULD NOT REVEAL ANY OTHER INFO IT IS HARD TO SPECULATE ON ANY POSSIBLE CAUSES OF THIS INCIDENT. CBC CONVERSATION WITH RPTR REVEALED THE FOLLOWING: REPORTER WAS COPLT AND AFTER LNDG THE CALL TO ZOA WAS BY PIC. ACR Y WAS INBND TO SEATTLE/VANCOUVER AREA ON XING COURSE. REPORTER HAS HEARD NOTHING FURTHER REF THE INCIDENT. PIC HAD SAID HE WAS NOT GOING TO PURSUE IT OTHER THAN A RPT TO HIS COMPANY CHIEF PLT. FLT CREW OF X DID NOT SEE ACR Y.

Data retrieved from NASA's ASRS site as of August 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.