Government aircraft descends below assigned altitude due to altitude capture failure.

Attributes
ACN	305680
Time
Date	199505
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cvg
State Reference	OH
Altitude	msl bound lower : 8700 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cvg
Operator	other
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 91
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	government other
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time total : 8700
ASRS Report	305680
Person 2
Affiliation	government other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : became reoriented flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Descending to 9000 ft. Reset autoplt, did not notice altitude capture feature kicked off. Descended below 9000 ft to 8700 ft, was correcting when noticed by ATC.

Original NASA ASRS Text

Title: GOV ACFT DSNDS BELOW ASSIGNED ALT DUE TO ALT CAPTURE FAILURE.

Narrative: DSNDING TO 9000 FT. RESET AUTOPLT, DID NOT NOTICE ALT CAPTURE FEATURE KICKED OFF. DSNDED BELOW 9000 FT TO 8700 FT, WAS CORRECTING WHEN NOTICED BY ATC.

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.