ZID associate controller observed operational error at FL270 with climbing traffic.

Attributes
ACN	610120
Time
Date	200403
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : rod.vortac
State Reference	OH
Altitude	msl bound lower : 26300 msl bound upper : 27000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude climbout : vacating altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	A310
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 radar : 15
ASRS Report	610120
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 18
ASRS Report	610121
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 24000 vertical : 700
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Flight X, FL250, clearance to FL270. Second clearance to FL290, no delay through FL270 for traffic at FL260. Radar controller thought air carrier Y would fall in behind air carrier X. Controller saw situation at the same time as conflict alert. Tried to descend air carrier X back to FL250. Did not get a reply in time.

Original NASA ASRS Text

Title: ZID ASSOCIATE CTLR OBSERVED OPERROR AT FL270 WITH CLBING TFC.

Narrative: FLT X, FL250, CLRNC TO FL270. SECOND CLRNC TO FL290, NO DELAY THROUGH FL270 FOR TFC AT FL260. RADAR CTLR THOUGHT ACR Y WOULD FALL IN BEHIND ACR X. CTLR SAW SIT AT THE SAME TIME AS CONFLICT ALERT. TRIED TO DSND ACR X BACK TO FL250. DID NOT GET A REPLY IN TIME.

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.