Cpr flight crew of light transport exceeded 250 KIAS below 10000 ft in ord class B airspace.

Attributes
ACN	425180
Time
Date	199901
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mdw
State Reference	IL
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Commercial Fixed Wing
Flight Phase	cruise other
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 190 flight time total : 8000 flight time type : 5000
ASRS Report	425180
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Events
Anomaly	non adherence : far
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Air Traffic Incident	Pilot Deviation

Narrative:

After takeoff from mdw, we were level at 4000 ft. I was taking care of after takeoff duties and looking for other traffic. The PF must have also been looking for traffic or concentrating on something else. Neither of us noticed the airspeed increasing. We received a clearance to a higher altitude. While reading back the clearance, the overspd horn went off. The climb and power reduction reduced the airspeed to 250 KIAS.

Original NASA ASRS Text

Title: CPR FLC OF LTT EXCEEDED 250 KIAS BELOW 10000 FT IN ORD CLASS B AIRSPACE.

Narrative: AFTER TKOF FROM MDW, WE WERE LEVEL AT 4000 FT. I WAS TAKING CARE OF AFTER TKOF DUTIES AND LOOKING FOR OTHER TFC. THE PF MUST HAVE ALSO BEEN LOOKING FOR TFC OR CONCENTRATING ON SOMETHING ELSE. NEITHER OF US NOTICED THE AIRSPD INCREASING. WE RECEIVED A CLRNC TO A HIGHER ALT. WHILE READING BACK THE CLRNC, THE OVERSPD HORN WENT OFF. THE CLB AND PWR REDUCTION REDUCED THE AIRSPD TO 250 KIAS.

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.