A descending MD80 overshot its assigned altitude by 400 ft while on autoplt, altitude capture mode.

Attributes
ACN	412710
Time
Date	199808
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : eno
State Reference	DE
Altitude	msl bound lower : 23600 msl bound upper : 24000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star enroute airway : zdc
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 280 flight time total : 4000 flight time type : 40
ASRS Report	412710
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : crossing restriction not met altitude deviation : overshoot non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Cleared to cross ridgy at FL240 on rbv 1. FL240 set and armed for altitude capture. With high descent rate, aircraft went through FL240 by 300-400 ft and did not capture altitude. Autoplt on. Immediately manually leveled at FL240. Center said nothing.

Original NASA ASRS Text

Title: A DSNDING MD80 OVERSHOT ITS ASSIGNED ALT BY 400 FT WHILE ON AUTOPLT, ALT CAPTURE MODE.

Narrative: CLRED TO CROSS RIDGY AT FL240 ON RBV 1. FL240 SET AND ARMED FOR ALT CAPTURE. WITH HIGH DSCNT RATE, ACFT WENT THROUGH FL240 BY 300-400 FT AND DID NOT CAPTURE ALT. AUTOPLT ON. IMMEDIATELY MANUALLY LEVELED AT FL240. CTR SAID NOTHING.

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.