Less than standard separation between two air carrier. Operational error.

Attributes
ACN	101923
Time
Date	198901
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ocs
State Reference	WY
Altitude	msl bound lower : 36400 msl bound upper : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc tracon : grb
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : non radar
Qualification	controller : radar
Experience	controller radar : 19
ASRS Report	101923
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 20
ASRS Report	101922
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified
Resolutory Action	none taken : unable
Consequence	faa : investigated
Miss Distance	horizontal : 19500 vertical : 600
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X descending to FL330, through en route at FL370. Air carrier X passed air carrier Y with less than 5 miles and less than 2000'. Callback conversation with reporter revealed following information. Reporter gave experience level of 3 controllers involved. There was OJT being conducted on manual position and on radar position. Also gave miss distances as determined by operation error review. Supplemental information from acn 101922. Sector 40/39 was busy with 19 contacts, including climbing aircraft, descending aircraft and en route aircraft. Air carrier X was cleared from FL390 to FL330 in preparation for landing about 25 miles east of ocs. Just west of ocs, air carrier X was turned to a 300 degree heading for spacing and sequencing into slc. Conflict alert activated between X at FL364 and air carrier Y at FL370 en route to atl.

Original NASA ASRS Text

Title: LESS THAN STANDARD SEPARATION BETWEEN TWO ACR. OPERATIONAL ERROR.

Narrative: ACR X DSNDING TO FL330, THROUGH ENRTE AT FL370. ACR X PASSED ACR Y WITH LESS THAN 5 MILES AND LESS THAN 2000'. CALLBACK CONVERSATION WITH RPTR REVEALED FOLLOWING INFO. RPTR GAVE EXPERIENCE LEVEL OF 3 CTLRS INVOLVED. THERE WAS OJT BEING CONDUCTED ON MANUAL POSITION AND ON RADAR POSITION. ALSO GAVE MISS DISTANCES AS DETERMINED BY OP ERROR REVIEW. SUPPLEMENTAL INFO FROM ACN 101922. SECTOR 40/39 WAS BUSY WITH 19 CONTACTS, INCLUDING CLBING ACFT, DSNDING ACFT AND ENRTE ACFT. ACR X WAS CLRED FROM FL390 TO FL330 IN PREPARATION FOR LNDG ABOUT 25 MILES E OF OCS. JUST W OF OCS, ACR X WAS TURNED TO A 300 DEG HDG FOR SPACING AND SEQUENCING INTO SLC. CONFLICT ALERT ACTIVATED BTWN X AT FL364 AND ACR Y AT FL370 ENRTE TO ATL.

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.