Air carrier X had less than standard separation from air carrier Y. System error.

Attributes
ACN	187884
Time
Date	199108
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : jac
State Reference	WY
Altitude	msl bound lower : 24300 msl bound upper : 24300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 4
ASRS Report	187884
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 24000 vertical : 700
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X checked on frequency climbing to FL260. FL240 was shown in the data block, and the FL260 call was missed. Aircraft lost separation with air carrier Y at FL243 and 4 mi.

Original NASA ASRS Text

Title: ACR X HAD LTSS FROM ACR Y. SYS ERROR.

Narrative: ACR X CHKED ON FREQ CLBING TO FL260. FL240 WAS SHOWN IN THE DATA BLOCK, AND THE FL260 CALL WAS MISSED. ACFT LOST SEPARATION WITH ACR Y AT FL243 AND 4 MI.

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.