ZMA apparently issues climb clearance to wrong aircraft with similar call sign, correcting the condition prior to a loss of separation. Pilot/controller readback hearback event.

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Attributes
ACN	506850
Time
Date	200104
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zma.artcc
State Reference	FL
Altitude	msl bound lower : 26000 msl bound upper : 29000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mso.tower
Operator	common carrier : air carrier
Make Model Name	Airbus Industrie Undifferentiated or Other Model
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zma.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
ASRS Report	506850
Events
Anomaly	non adherence : published procedure
Resolutory Action	controller : separated traffic controller : issued advisory
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

We were at FL260, requested FL310 at XA00. ZMA then cleared air carrier X to FL310 at approximately XA03. Captain responded 'air carrier X, leaving FL260 for FL310.' miami, 'roger.' passing FL283, ZMA told us to level at FL290, which we did. ZMA asked air carrier Y his altitude (FL280) and said another aircraft responded to his clearance of FL310. Air carrier Y said it didn't ask for FL310, nor did he hear clearance to FL310. We stayed at FL290 for approximately 5 mins, then cleared to FL310 by ZMA.

Original NASA ASRS Text

Title: ZMA APPARENTLY ISSUES CLB CLRNC TO WRONG ACFT WITH SIMILAR CALL SIGN, CORRECTING THE CONDITION PRIOR TO A LOSS OF SEPARATION. PLT/CTLR READBACK HEARBACK EVENT.

Narrative: WE WERE AT FL260, REQUESTED FL310 AT XA00. ZMA THEN CLRED ACR X TO FL310 AT APPROX XA03. CAPT RESPONDED 'ACR X, LEAVING FL260 FOR FL310.' MIAMI, 'ROGER.' PASSING FL283, ZMA TOLD US TO LEVEL AT FL290, WHICH WE DID. ZMA ASKED ACR Y HIS ALT (FL280) AND SAID ANOTHER ACFT RESPONDED TO HIS CLRNC OF FL310. ACR Y SAID IT DIDN'T ASK FOR FL310, NOR DID HE HEAR CLRNC TO FL310. WE STAYED AT FL290 FOR APPROX 5 MINS, THEN CLRED TO FL310 BY ZMA.

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.