Altitude overshoot during descent for approach to chicago, il.

Attributes
ACN	484830
Time
Date	200009
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	msl bound lower : 6650 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	MD-90 Series (DC-9-90) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other Other
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 15000 flight time type : 5400
ASRS Report	484830
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 3500 flight time type : 1000
ASRS Report	485047
Events
Anomaly	altitude deviation : overshoot non adherence : clearance non adherence : published procedure non adherence : company policies other anomaly other
Independent Detector	aircraft equipment : altitude alert other controllerb
Resolutory Action	controller : issued advisory flight crew : returned to assigned altitude other
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Descending into ord -- last min change of runway to runway 14R, cleared to 7000 ft. During the last 2000 ft of descent we were given multiple speed reductions in 10 KT increments, making me believe a more rapid speed reduction was needed. I rolled in a more shallow descent rate in vertical speed without observing FMA, not realizing autoplt had already entered the capture mode. This canceled the capture, resulting in an approximately 350 ft deviation. Altitude alert went off, followed by corrective action at the same time as the controller reannounced our clearance to maintain 7000 ft.

Original NASA ASRS Text

Title: ALT OVERSHOOT DURING DSCNT FOR APCH TO CHICAGO, IL.

Narrative: DSNDING INTO ORD -- LAST MIN CHANGE OF RWY TO RWY 14R, CLRED TO 7000 FT. DURING THE LAST 2000 FT OF DSCNT WE WERE GIVEN MULTIPLE SPD REDUCTIONS IN 10 KT INCREMENTS, MAKING ME BELIEVE A MORE RAPID SPD REDUCTION WAS NEEDED. I ROLLED IN A MORE SHALLOW DSCNT RATE IN VERT SPD WITHOUT OBSERVING FMA, NOT REALIZING AUTOPLT HAD ALREADY ENTERED THE CAPTURE MODE. THIS CANCELED THE CAPTURE, RESULTING IN AN APPROX 350 FT DEV. ALT ALERT WENT OFF, FOLLOWED BY CORRECTIVE ACTION AT THE SAME TIME AS THE CTLR REANNOUNCED OUR CLRNC TO MAINTAIN 7000 FT.

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.