Aircraft X was cleared to FL290, reporter had opposite direction traffic (aircraft Y) at FL280. Reporter changed data block altitude of aircraft X to FL270, but never reclred aircraft X. Loss standard separation.

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Attributes
ACN	446216
Time
Date	199908
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	intersection : yocky
State Reference	KY
Altitude	msl bound lower : 27000 msl bound upper : 28000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 1 controller radar : 14
ASRS Report	446216
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne critical non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment : tcas other controllera other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	faa : investigated
Miss Distance	horizontal : 7800 vertical : 500
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft X was cleared from FL230 to FL290. Subsequently a handoff was taken on aircraft Y northbound (opposite direction) of aircraft X. Controller failed to restate the new altitude assignment of FL270 after updating data block. Error was not noticed till aircraft X climbed through aircraft Y's altitude.

Original NASA ASRS Text

Title: ACFT X WAS CLRED TO FL290, RPTR HAD OPPOSITE DIRECTION TFC (ACFT Y) AT FL280. RPTR CHANGED DATA BLOCK ALT OF ACFT X TO FL270, BUT NEVER RECLRED ACFT X. LOSS STANDARD SEPARATION.

Narrative: ACFT X WAS CLRED FROM FL230 TO FL290. SUBSEQUENTLY A HDOF WAS TAKEN ON ACFT Y NBOUND (OPPOSITE DIRECTION) OF ACFT X. CTLR FAILED TO RESTATE THE NEW ALT ASSIGNMENT OF FL270 AFTER UPDATING DATA BLOCK. ERROR WAS NOT NOTICED TILL ACFT X CLBED THROUGH ACFT Y'S ALT.

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.