Flight crew of CL65 erroneously climbed above disputed altitude near spa.

Attributes
ACN	425470
Time
Date	199901
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : spa
State Reference	SC
Altitude	msl bound lower : 20000 msl bound upper : 22000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Challenger CL604
Navigation In Use	Other
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 270 flight time total : 13600 flight time type : 650
ASRS Report	425470
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	altitude deviation : overshoot other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	none taken : detected after the fact other
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

While climbing through FL200 (to FL220) ZTL cleared us back down to FL200. There was a moment of confusion as to what our original clearance altitude was. There was no conflict with any traffic in the area.

Original NASA ASRS Text

Title: FLC OF CL65 ERRONEOUSLY CLBED ABOVE DISPUTED ALT NEAR SPA.

Narrative: WHILE CLBING THROUGH FL200 (TO FL220) ZTL CLRED US BACK DOWN TO FL200. THERE WAS A MOMENT OF CONFUSION AS TO WHAT OUR ORIGINAL CLRNC ALT WAS. THERE WAS NO CONFLICT WITH ANY TFC IN THE AREA.

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.