A descending air carrier light transport overshot its assigned altitude when the autoplt fails to level the aircraft. Crew was busy with checklists.

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Attributes
ACN	419420
Time
Date	199811
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : cvg
State Reference	OH
Environment
Flight Conditions	Marginal
Light	Dusk
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Navigation In Use	Other
Flight Phase	descent other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 200 flight time total : 14000 flight time type : 6800
ASRS Report	419420
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : became reoriented flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Air Traffic Incident	Pilot Deviation

Narrative:

During expedited descent for landing, autoplt failed to capture altitude, resulting in a 300 ft (low) deviation from assigned altitude. We were both distraction by finishing checklist and setting navaids. I noticed the descent at assigned altitude, but it took 300 ft to stop descent. Someone always needs to monitor automation.

Original NASA ASRS Text

Title: A DSNDING ACR LTT OVERSHOT ITS ASSIGNED ALT WHEN THE AUTOPLT FAILS TO LEVEL THE ACFT. CREW WAS BUSY WITH CHKLISTS.

Narrative: DURING EXPEDITED DSCNT FOR LNDG, AUTOPLT FAILED TO CAPTURE ALT, RESULTING IN A 300 FT (LOW) DEV FROM ASSIGNED ALT. WE WERE BOTH DISTR BY FINISHING CHKLIST AND SETTING NAVAIDS. I NOTICED THE DSCNT AT ASSIGNED ALT, BUT IT TOOK 300 FT TO STOP DSCNT. SOMEONE ALWAYS NEEDS TO MONITOR AUTOMATION.

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.