Atx cargo turboprop encounters moderate to severe turbulence 15 mi northeast of mso VOR and overshot en route altitude of 10000 ft.

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Attributes
ACN	511950
Time
Date	200105
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : mso.vortac
State Reference	MT
Altitude	msl bound lower : 9600 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Commercial Fixed Wing
Flight Phase	climbout : intermediate altitude descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 120 flight time total : 10000 flight time type : 5000
ASRS Report	511950
Events
Anomaly	altitude deviation : overshoot inflight encounter : turbulence inflight encounter : weather inflight encounter other
Resolutory Action	flight crew : exited adverse environment flight crew : regained aircraft control
Consequence	other
Supplementary
Problem Areas	Environmental Factor Weather
Primary Problem	Weather

Narrative:

I was cleared to 10000 ft from FL190. In the descent, I encountered moderate to severe turbulence. When I got to 10000 ft, I encountered downdrafts which caused me to go through my assigned altitude by 400 ft. I was VMC at this time, so I canceled my IFR and proceeded to the airport. There were no other aircraft in the area.

Original NASA ASRS Text

Title: ATX CARGO TURBOPROP ENCOUNTERS MODERATE TO SEVERE TURB 15 MI NE OF MSO VOR AND OVERSHOT ENRTE ALT OF 10000 FT.

Narrative: I WAS CLRED TO 10000 FT FROM FL190. IN THE DSCNT, I ENCOUNTERED MODERATE TO SEVERE TURB. WHEN I GOT TO 10000 FT, I ENCOUNTERED DOWNDRAFTS WHICH CAUSED ME TO GO THROUGH MY ASSIGNED ALT BY 400 FT. I WAS VMC AT THIS TIME, SO I CANCELED MY IFR AND PROCEEDED TO THE ARPT. THERE WERE NO OTHER ACFT 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.