Pilot of small transport twin engine atx aircraft loss aircraft control when encountering a thunderstorm resulting in overshooting assigned altitude and deviation from assigned heading.

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Attributes
ACN	241296
Time
Date	199305
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : pia
State Reference	IL
Altitude	msl bound lower : 19500 msl bound upper : 21600
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air taxi
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 110 flight time total : 2840
ASRS Report	241296
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	altitude deviation : overshoot inflight encounter : weather other anomaly other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : regained aircraft control
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation

Narrative:

En route det I asked for and was given clearance from 17000 ft to 21000 ft to clear some cumulus buildups in front of me. I made a 10 degree deviation north, hoping to get around the buildup. I entered the buildup at 20500 ft in the next 2 mins I was as high as 21500 ft and a low as 19500 ft exiting the other side at 20000 ft. All this time I was too busy keeping the airplane level to inform center what was happening.

Original NASA ASRS Text

Title: PLT OF SMT TWIN ENG ATX ACFT LOSS ACFT CTL WHEN ENCOUNTERING A TSTM RESULTING IN OVERSHOOTING ASSIGNED ALT AND DEV FROM ASSIGNED HDG.

Narrative: ENRTE DET I ASKED FOR AND WAS GIVEN CLRNC FROM 17000 FT TO 21000 FT TO CLR SOME CUMULUS BUILDUPS IN FRONT OF ME. I MADE A 10 DEG DEV N, HOPING TO GET AROUND THE BUILDUP. I ENTERED THE BUILDUP AT 20500 FT IN THE NEXT 2 MINS I WAS AS HIGH AS 21500 FT AND A LOW AS 19500 FT EXITING THE OTHER SIDE AT 20000 FT. ALL THIS TIME I WAS TOO BUSY KEEPING THE AIRPLANE LEVEL TO INFORM CTR WHAT WAS HAPPENING.

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.