A westwind captain reported an altitude deviation while in the vicinity of hou.

Attributes
ACN	510650
Time
Date	200105
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cll.airport
State Reference	TX
Altitude	msl single value : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	IAI1124/1124A/Westwind
Flight Phase	descent : 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 : 65 flight time total : 9600 flight time type : 965
ASRS Report	510650
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : turbulence inflight encounter other non adherence : clearance non adherence : published procedure non adherence : company policies non adherence : far
Resolutory Action	flight crew : returned to assigned altitude
Supplementary
Problem Areas	Weather Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Descent to 10000 ft in building cumulus clouds and bumpy conditions. Autoplt did not capture in the turbulence and aircraft descended to about 8700 ft before correction was made. Sunlight through side windows put glare on autoplt control mode indicator panel.

Original NASA ASRS Text

Title: A WESTWIND CAPT RPTED AN ALTDEV WHILE IN THE VICINITY OF HOU.

Narrative: DSCNT TO 10000 FT IN BUILDING CUMULUS CLOUDS AND BUMPY CONDITIONS. AUTOPLT DID NOT CAPTURE IN THE TURB AND ACFT DSNDED TO ABOUT 8700 FT BEFORE CORRECTION WAS MADE. SUNLIGHT THROUGH SIDE WINDOWS PUT GLARE ON AUTOPLT CTL MODE INDICATOR PANEL.

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.