A descending DO328 flight crew exceeds the 250 KT rule below 10000 ft 40 mi from bis, nd.

Attributes
ACN	481300
Time
Date	200008
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : bis.airport
State Reference	ND
Altitude	msl bound lower : 5000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : bis.tracon
Operator	common carrier : air carrier
Make Model Name	Do 328 TP (Turboprop)
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 4000 flight time type : 2500
ASRS Report	481300
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument
Events
Anomaly	non adherence : far non adherence : company policies other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : became reoriented
Consequence	Other
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Descending through 10000 ft MSL, airspeed increased past 250 KTS to 260 KTS. Next time I realized it, we were at 5000 ft MSL. I immediately retarded power and reduced airspeed to less than 250 KTS. Nothing was said by any controller.

Original NASA ASRS Text

Title: A DSNDING DO328 FLC EXCEEDS THE 250 KT RULE BELOW 10000 FT 40 MI FROM BIS, ND.

Narrative: DSNDING THROUGH 10000 FT MSL, AIRSPD INCREASED PAST 250 KTS TO 260 KTS. NEXT TIME I REALIZED IT, WE WERE AT 5000 FT MSL. I IMMEDIATELY RETARDED PWR AND REDUCED AIRSPD TO LESS THAN 250 KTS. NOTHING WAS SAID BY ANY CTLR.

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.