A cpr jet acknowledges a clearance and leaves FL260 when they believe their call sign was used. Center controller sends them back up.

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Attributes
ACN	432056
Time
Date	199903
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : jot.vortac
State Reference	IL
Altitude	msl bound lower : 25500 msl bound upper : 26000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau.artcc
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Navigation In Use	other vortac
Flight Phase	cruise : level descent : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zau.artcc
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Navigation In Use	other vortac
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial pilot : multi engine
Experience	flight time last 90 days : 120 flight time total : 2400 flight time type : 450
ASRS Report	432056
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	atc equipment other atc equipment : radar other controllera
Resolutory Action	controller : issued alert controller : issued new clearance
Supplementary
Problem Areas	ATC Human Performance Environmental Factor Flight Crew Human Performance
Primary Problem	ATC Human Performance

Narrative:

While in cruise at FL260, ZAU issued a 'descend to FL240' to what the PNF and PF both heard as 'ncxbnc.' we vacated FL260, and, descending through FL255, were queried on our altitude. We stated that we were descending to FL240, as we had been cleared and read back. Controller told us to return to FL260, and subsequently cleared another aircraft to leave FL260 for FL240. We believe the other aircraft call sign was cbbc. The controller called us to clarify, and we responded that we had heard 'cxbnc, descend to FL240,' that we had read that back, and had then done so. We believe the controller had meant to issue the other aircraft, cbbc, the descent clearance, but had either said the wrong call sign himself, or had not listened for a readback. It did not appear to cause any safety or traffic conflict, by the way.

Original NASA ASRS Text

Title: A CPR JET ACKNOWLEDGES A CLRNC AND LEAVES FL260 WHEN THEY BELIEVE THEIR CALL SIGN WAS USED. CTR CTLR SENDS THEM BACK UP.

Narrative: WHILE IN CRUISE AT FL260, ZAU ISSUED A 'DSND TO FL240' TO WHAT THE PNF AND PF BOTH HEARD AS 'NCXBNC.' WE VACATED FL260, AND, DSNDING THROUGH FL255, WERE QUERIED ON OUR ALT. WE STATED THAT WE WERE DSNDING TO FL240, AS WE HAD BEEN CLRED AND READ BACK. CTLR TOLD US TO RETURN TO FL260, AND SUBSEQUENTLY CLRED ANOTHER ACFT TO LEAVE FL260 FOR FL240. WE BELIEVE THE OTHER ACFT CALL SIGN WAS CBBC. THE CTLR CALLED US TO CLARIFY, AND WE RESPONDED THAT WE HAD HEARD 'CXBNC, DSND TO FL240,' THAT WE HAD READ THAT BACK, AND HAD THEN DONE SO. WE BELIEVE THE CTLR HAD MEANT TO ISSUE THE OTHER ACFT, CBBC, THE DSCNT CLRNC, BUT HAD EITHER SAID THE WRONG CALL SIGN HIMSELF, OR HAD NOT LISTENED FOR A READBACK. IT DID NOT APPEAR TO CAUSE ANY SAFETY OR TFC CONFLICT, BY THE WAY.

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.