Flight crew had an mdt turboprop overshoot descent altitude because they had not engaged the altitude preselect button of the autoplt.

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Attributes
ACN	355170
Time
Date	199611
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dca
State Reference	VA
Altitude	msl bound lower : 3600 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dca tower : mia
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
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 : 100 flight time total : 3200 flight time type : 100
ASRS Report	355170
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Altitude select button on autoplt panel was not engaged during descent. Therefore, aircraft descended below preset altitude of 4000 ft. By the time we realized it, we were at 3600 ft.

Original NASA ASRS Text

Title: FLC HAD AN MDT TURBOPROP OVERSHOOT DSCNT ALT BECAUSE THEY HAD NOT ENGAGED THE ALT PRESELECT BUTTON OF THE AUTOPLT.

Narrative: ALT SELECT BUTTON ON AUTOPLT PANEL WAS NOT ENGAGED DURING DSCNT. THEREFORE, ACFT DSNDED BELOW PRESET ALT OF 4000 FT. BY THE TIME WE REALIZED IT, WE WERE AT 3600 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.