Medium large transport overshot 12000 ft while descending.

Attributes
ACN	343550
Time
Date	199608
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dtw
State Reference	MI
Altitude	msl bound lower : 11700 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other descent other
Route In Use	arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : cfi pilot : instrument pilot : atp
Experience	flight time last 90 days : 120 flight time total : 6000 flight time type : 75
ASRS Report	343550
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 220 flight time total : 13000 flight time type : 2500
ASRS Report	343393
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:

Flying polar STAR to dtw, previous controller had difficulty receiving our xmissions over mkg. While in a descent to 12000 ft MSL from 22000 ft we inadvertently descended slightly below 12000 ft while trying to understand a clearance to keep present airspeed instead of slowing to 250 KTS as previously cleared. No conflict was incurred and we immediately returned to 12000 ft within 10 seconds. No problems were noted with ZOB.

Original NASA ASRS Text

Title: MLG OVERSHOT 12000 FT WHILE DSNDING.

Narrative: FLYING POLAR STAR TO DTW, PREVIOUS CTLR HAD DIFFICULTY RECEIVING OUR XMISSIONS OVER MKG. WHILE IN A DSCNT TO 12000 FT MSL FROM 22000 FT WE INADVERTENTLY DSNDED SLIGHTLY BELOW 12000 FT WHILE TRYING TO UNDERSTAND A CLRNC TO KEEP PRESENT AIRSPD INSTEAD OF SLOWING TO 250 KTS AS PREVIOUSLY CLRED. NO CONFLICT WAS INCURRED AND WE IMMEDIATELY RETURNED TO 12000 FT WITHIN 10 SECONDS. NO PROBS WERE NOTED WITH ZOB.

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.