Altitude deviation overshoot on descent.

Attributes
ACN	319080
Time
Date	199510
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : flm
State Reference	KY
Altitude	msl bound lower : 19500 msl bound upper : 20000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 7000 flight time type : 3000
ASRS Report	319080
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 17000 flight time type : 3000
Events
Anomaly	altitude deviation : excursion from assigned altitude altitude deviation : overshoot non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : became reoriented flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Aircraft was descending from FL220 to FL200 with autoplt/autothrottles engaged. Descent mode was 'IAS.' as the aircraft descended through FL200 (assigned altitude), pilots disengaged the autoplt and stopped the descent by FL195, then climbed back to FL200. The autoplt failed to capture the altitude set in the autoplt altitude select window. There was no conflict with other traffic and the ATC controller said nothing about the deviation.

Original NASA ASRS Text

Title: ALTDEV OVERSHOOT ON DSCNT.

Narrative: ACFT WAS DSNDING FROM FL220 TO FL200 WITH AUTOPLT/AUTOTHROTTLES ENGAGED. DSCNT MODE WAS 'IAS.' AS THE ACFT DSNDED THROUGH FL200 (ASSIGNED ALT), PLTS DISENGAGED THE AUTOPLT AND STOPPED THE DSCNT BY FL195, THEN CLBED BACK TO FL200. THE AUTOPLT FAILED TO CAPTURE THE ALT SET IN THE AUTOPLT ALT SELECT WINDOW. THERE WAS NO CONFLICT WITH OTHER TFC AND THE ATC CTLR SAID NOTHING ABOUT THE DEV.

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.