BE200 climbed above assigned altitude on departure from apa.

Attributes
ACN	434800
Time
Date	199904
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dia.airport
State Reference	CO
Altitude	msl bound lower : 20000 msl bound upper : 21000
Environment
Flight Conditions	IMC
Weather Elements	Ice Snow Turbulence
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv.artcc tower : phx.tower
Operator	general aviation : corporate
Make Model Name	Super King Air 200 HDC
Operating Under FAR Part	Part 91
Flight Plan	IFR
Aircraft 2
Flight Phase	cruise : enroute altitude change
Person 1
Affiliation	company : corporate
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 25 flight time total : 2300 flight time type : 50
ASRS Report	434800
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued alert
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Climbing out of apa yellowstone 1 SID, misinterped clearance as FL220 when clearance was for FL200. Climbed to FL210 before aircraft was taken back to FL200.

Original NASA ASRS Text

Title: BE200 CLBED ABOVE ASSIGNED ALT ON DEP FROM APA.

Narrative: CLBING OUT OF APA YELLOWSTONE 1 SID, MISINTERPED CLRNC AS FL220 WHEN CLRNC WAS FOR FL200. CLBED TO FL210 BEFORE ACFT WAS TAKEN BACK TO FL200.

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.