LR60 in ZAU's airspace climbs above assigned FL310 because of wind conditions.

Attributes
ACN	596433
Time
Date	200310
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : zau.artcc
State Reference	IL
Altitude	msl single value : 31000
Environment
Flight Conditions	IMC
Weather Elements	Snow Turbulence
Light	Night
Aircraft 1
Controlling Facilities	artcc : zau.artcc
Operator	general aviation : corporate
Make Model Name	Learjet 60
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 90 flight time total : 8275 flight time type : 1386
ASRS Report	596433
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 100 flight time total : 2600 flight time type : 600
ASRS Report	596726
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : turbulence non adherence : clearance
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : returned to assigned altitude flight crew : exited adverse environment flight crew : regained aircraft control
Miss Distance	vertical : 900
Supplementary
Problem Areas	Weather
Primary Problem	Weather

Narrative:

We departed dsm at approximately XA00 local (captain was PNF). Leveling FL310, we were about 300 ft below, we were in IMC. It was snowing and we were in moderate turbulence. Suddenly we were in a climb between 3000-5000 FPM. The wind had changed from around 60 KTS to over 100 KTS. The temperature (sat) was -27 degrees C. We immediately decreased the power and the angle of attack. By now we were 1000 ft above our altitude (FL310). At this point we decreased more the angle of attack to stop the climb and descend to FL310. There was traffic approximately 900 ft above. By this time the climb had stopped and we were returning to the altitude where the ATC called.

Original NASA ASRS Text

Title: LR60 IN ZAU'S AIRSPACE CLBS ABOVE ASSIGNED FL310 BECAUSE OF WIND CONDITIONS.

Narrative: WE DEPARTED DSM AT APPROX XA00 LCL (CAPT WAS PNF). LEVELING FL310, WE WERE ABOUT 300 FT BELOW, WE WERE IN IMC. IT WAS SNOWING AND WE WERE IN MODERATE TURB. SUDDENLY WE WERE IN A CLB BTWN 3000-5000 FPM. THE WIND HAD CHANGED FROM AROUND 60 KTS TO OVER 100 KTS. THE TEMP (SAT) WAS -27 DEGS C. WE IMMEDIATELY DECREASED THE PWR AND THE ANGLE OF ATTACK. BY NOW WE WERE 1000 FT ABOVE OUR ALT (FL310). AT THIS POINT WE DECREASED MORE THE ANGLE OF ATTACK TO STOP THE CLB AND DSND TO FL310. THERE WAS TFC APPROX 900 FT ABOVE. BY THIS TIME THE CLB HAD STOPPED AND WE WERE RETURNING TO THE ALT WHERE THE ATC CALLED.

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.