P180 pilot set the altimeter to qnh before the transition altitude, and had an altitude overshoot when the controller told the aircraft to level at FL200 in ZDC class a.

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Attributes
ACN	582056
Time
Date	200304
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zdc.artcc
State Reference	VA
Altitude	msl bound lower : 19600 msl bound upper : 20000
Environment
Flight Conditions	IMC
Weather Elements	Ice
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc
Operator	general aviation : corporate
Make Model Name	Small Transport
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 140 flight time total : 9500 flight time type : 300
ASRS Report	582056
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	altitude deviation : overshoot non adherence : far non adherence : published procedure non adherence : clearance other anomaly other
Independent Detector	atc equipment other atc equipment : radar mode c other controllera
Resolutory Action	controller : issued advisory controller : issued new clearance flight crew : returned to assigned altitude other
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

ZDC cleared our aircraft to descend from FL240 to 15000 ft and gave us the local altimeter setting of 30.32. I reset the altimeter to 30.32. After starting our descent ATC amended the clearance and told us to level off at FL200. We did, however, I did not reset the altimeter back to 29.92. As a result, when we leveled off our aircraft was 400 ft low (19600 ft MSL) instead of FL200. ATC asked me to clarify our altitude. I told them my altimeter was set wrong. They gave me a heading change and I climbed back to FL200.

Original NASA ASRS Text

Title: P180 PLT SET THE ALTIMETER TO QNH BEFORE THE TRANSITION ALT, AND HAD AN ALT OVERSHOOT WHEN THE CTLR TOLD THE ACFT TO LEVEL AT FL200 IN ZDC CLASS A.

Narrative: ZDC CLRED OUR ACFT TO DSND FROM FL240 TO 15000 FT AND GAVE US THE LCL ALTIMETER SETTING OF 30.32. I RESET THE ALTIMETER TO 30.32. AFTER STARTING OUR DSCNT ATC AMENDED THE CLRNC AND TOLD US TO LEVEL OFF AT FL200. WE DID, HOWEVER, I DID NOT RESET THE ALTIMETER BACK TO 29.92. AS A RESULT, WHEN WE LEVELED OFF OUR ACFT WAS 400 FT LOW (19600 FT MSL) INSTEAD OF FL200. ATC ASKED ME TO CLARIFY OUR ALT. I TOLD THEM MY ALTIMETER WAS SET WRONG. THEY GAVE ME A HEADING CHANGE AND I CLBED 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.