An air carrier first officer reported an altitude overshoot while flying the approach to iah.

Attributes
ACN	515590
Time
Date	200106
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : i90.tracon
State Reference	TX
Altitude	msl single value : 10000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 55 flight time total : 5400 flight time type : 55
ASRS Report	515590
Events
Anomaly	altitude deviation : overshoot non adherence : company policies non adherence : clearance non adherence : far
Resolutory Action	flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Autoplt failed to capture altitude level at 10000 ft. We descended a few hundred ft below, disconnected the autoplt, and returned to 10000 ft. ATC did not say anything, but shortly thereafter cleared us to 6000 ft. Should monitor autoplt altitude captures more closely.

Original NASA ASRS Text

Title: AN ACR FO RPTED AN ALT OVERSHOOT WHILE FLYING THE APCH TO IAH.

Narrative: AUTOPLT FAILED TO CAPTURE ALT LEVEL AT 10000 FT. WE DSNDED A FEW HUNDRED FT BELOW, DISCONNECTED THE AUTOPLT, AND RETURNED TO 10000 FT. ATC DID NOT SAY ANYTHING, BUT SHORTLY THEREAFTER CLRED US TO 6000 FT. SHOULD MONITOR AUTOPLT ALT CAPTURES MORE CLOSELY.

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.