Light transport bizjet crew had an altitude deviation in ZDV class east airspace.

Attributes
ACN	520170
Time
Date	200108
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zdc.artcc
State Reference	CO
Altitude	msl bound lower : 17000 msl bound upper : 17300
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pct.tracon
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 4300 flight time type : 1300
ASRS Report	520170
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather inflight encounter other
Resolutory Action	flight crew : returned to assigned altitude none taken : unable other
Supplementary
Problem Areas	Weather
Primary Problem	Weather

Narrative:

We were avoiding build-ups and turbulence. I disconnected the autoplt due to turbulence. As soon as I did that, we caught an updraft that caused us to go +300 ft above assigned altitude for a few seconds before I was able to correct it.

Original NASA ASRS Text

Title: LTT BIZJET CREW HAD AN ALTDEV IN ZDV CLASS E AIRSPACE.

Narrative: WE WERE AVOIDING BUILD-UPS AND TURB. I DISCONNECTED THE AUTOPLT DUE TO TURB. AS SOON AS I DID THAT, WE CAUGHT AN UPDRAFT THAT CAUSED US TO GO +300 FT ABOVE ASSIGNED ALT FOR A FEW SECONDS BEFORE I WAS ABLE TO CORRECT IT.

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.