Aircraft X took the clearance meant for aircraft Y, resulting in less than standard separation.

Attributes
ACN	463250
Time
Date	200002
Day	Fri
Local Time Of Day	0601 To 1200
Place
State Reference	TN
Altitude	msl single value : 26000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc tower : bwi.tower
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
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 : 3 controller radar : 15 controller time certified in position1 : 12
ASRS Report	463250
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	atc equipment : conflict alert atc equipment other atc equipment : edp other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	faa : investigated
Miss Distance	horizontal : 21246 vertical : 700
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

MD80 read back clearance for carj. Controller allowed clearance to stand, thinking that there was going to be sufficient separation. There was not.

Original NASA ASRS Text

Title: ACFT X TOOK THE CLRNC MEANT FOR ACFT Y, RESULTING IN LTSS.

Narrative: MD80 READ BACK CLRNC FOR CARJ. CTLR ALLOWED CLRNC TO STAND, THINKING THAT THERE WAS GOING TO BE SUFFICIENT SEPARATION. THERE WAS NOT.

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.