ZID controller experienced operational error at approximately fl 260 when amended altitude clearance was issued but not acknowledged by the flight crew.

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Attributes
ACN	798778
Time
Date	200808
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : ape.vortac
State Reference	OH
Altitude	msl single value : 26000
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	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 18
ASRS Report	798778
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert other controllera
Resolutory Action	controller : issued alert controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 15540 vertical : 600
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft #1 was descending into pit; leveled at FL270. Aircraft #2 was climbing off of cle; over ape VOR to FL280. Aircraft #2's altitude was amended to FL260 to stay beneath aircraft #1. I thought I got a readback and aircraft #2 was shipped to the next sector. When aircraft #2 was seen climbing through FL261; the next controller gave them an immediate descent to FL260. Reviewing the tapes showed that I had not gotten a readback on clearance of aircraft #2 to FL260.

Original NASA ASRS Text

Title: ZID CTLR EXPERIENCED OPERROR AT APPROX FL 260 WHEN AMENDED ALT CLRNC WAS ISSUED BUT NOT ACKNOWLEDGED BY THE FLT CREW.

Narrative: ACFT #1 WAS DSNDING INTO PIT; LEVELED AT FL270. ACFT #2 WAS CLBING OFF OF CLE; OVER APE VOR TO FL280. ACFT #2'S ALT WAS AMENDED TO FL260 TO STAY BENEATH ACFT #1. I THOUGHT I GOT A READBACK AND ACFT #2 WAS SHIPPED TO THE NEXT SECTOR. WHEN ACFT #2 WAS SEEN CLBING THROUGH FL261; THE NEXT CTLR GAVE THEM AN IMMEDIATE DSCNT TO FL260. REVIEWING THE TAPES SHOWED THAT I HAD NOT GOTTEN A READBACK ON CLRNC OF ACFT #2 TO FL260.

Data retrieved from NASA's ASRS site as of May 2009 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.