Radar controller issued altitude clearance to aircraft #1 that was meant for aircraft #2. Aircraft #1 acknowledged for clearance, controller never caught mistake. Resulted in an operational deviation.

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Attributes
ACN	423118
Time
Date	199807
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : cxr
State Reference	OH
Altitude	msl bound lower : 25000 msl bound upper : 35000
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Experience	controller military : 3 controller radar : 14
ASRS Report	423118
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Air Traffic Incident	Operational Deviation

Narrative:

I was expecting aircraft #2 to check on frequency. Aircraft #2 needed to be descended to FL350. Aircraft #1 was issued my frequency by mistake. I issued aircraft #1 FL250 thinking I was saying aircraft #2, aircraft 1 answered and I didn't hear call sign.

Original NASA ASRS Text

Title: RADAR CTLR ISSUED ALT CLRNC TO ACFT #1 THAT WAS MEANT FOR ACFT #2. ACFT #1 ACKNOWLEDGED FOR CLRNC, CTLR NEVER CAUGHT MISTAKE. RESULTED IN AN OPDEV.

Narrative: I WAS EXPECTING ACFT #2 TO CHK ON FREQ. ACFT #2 NEEDED TO BE DSNDED TO FL350. ACFT #1 WAS ISSUED MY FREQ BY MISTAKE. I ISSUED ACFT #1 FL250 THINKING I WAS SAYING ACFT #2, ACFT 1 ANSWERED AND I DIDN'T HEAR CALL SIGN.

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.