ZID controller experienced separation loss at approximately 13000 ft when incorrect aircraft acknowledged clearance and controller failed to hear wrong readback.

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Attributes
ACN	701530
Time
Date	200606
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : zid.artcc
State Reference	IN
Altitude	msl bound lower : 13000 msl bound upper : 14000
Environment
Flight Conditions	IMC
Weather Elements	Thunderstorm Rain
Light	Night
Aircraft 1
Controlling Facilities	artcc : zid.artcc tower : skcl.tower
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet 700 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller limited radar : 6 controller non radar : 6 controller radar : 6
ASRS Report	701530
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
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 controller : issued alert flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 15600 vertical : 600
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

In general; WX impacting cvg departure route to the southeast. Cvg sends 2 departures out the arrival gate which utilizes dual streams of aircraft. Aircraft #1 is 'lost' in frequency land and checks in. I issued an 'amend altitude' clearance to XXXX and XXXB takes it. I miss the readback. Vectors were issued when conflict alert went off. Pilot of #1 aircraft is behind schedule and did not listen to whom clearance was issued; just took a clearance issued a turn but no altitude instruction and then aircraft #1 returned to its previously assigned altitude of 13000 ft. What could have been done differently? Wait 10 more mins to release aircraft #1 for departure while inbounds were filed in. Send the aircraft out the south departure route over lexington; ky. Earlier coordination with affected sector about deviating aircraft. Change call signs to possibly include alpha numerics XXXA-a and XXXB-D; etc; so not easily confused.

Original NASA ASRS Text

Title: ZID CTLR EXPERIENCED SEPARATION LOSS AT APPROX 13000 FT WHEN INCORRECT ACFT ACKNOWLEDGED CLRNC AND CTLR FAILED TO HEAR WRONG READBACK.

Narrative: IN GENERAL; WX IMPACTING CVG DEP RTE TO THE SE. CVG SENDS 2 DEPS OUT THE ARR GATE WHICH UTILIZES DUAL STREAMS OF ACFT. ACFT #1 IS 'LOST' IN FREQ LAND AND CHKS IN. I ISSUED AN 'AMEND ALT' CLRNC TO XXXX AND XXXB TAKES IT. I MISS THE READBACK. VECTORS WERE ISSUED WHEN CONFLICT ALERT WENT OFF. PLT OF #1 ACFT IS BEHIND SCHEDULE AND DID NOT LISTEN TO WHOM CLRNC WAS ISSUED; JUST TOOK A CLRNC ISSUED A TURN BUT NO ALT INSTRUCTION AND THEN ACFT #1 RETURNED TO ITS PREVIOUSLY ASSIGNED ALT OF 13000 FT. WHAT COULD HAVE BEEN DONE DIFFERENTLY? WAIT 10 MORE MINS TO RELEASE ACFT #1 FOR DEP WHILE INBOUNDS WERE FILED IN. SEND THE ACFT OUT THE S DEP RTE OVER LEXINGTON; KY. EARLIER COORD WITH AFFECTED SECTOR ABOUT DEVIATING ACFT. CHANGE CALL SIGNS TO POSSIBLY INCLUDE ALPHA NUMERICS XXXA-A AND XXXB-D; ETC; SO NOT EASILY CONFUSED.

Data retrieved from NASA's ASRS site as of January 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.