Speed deviation when arrival B737-300 crew exceeds the 250 KTS below 10000 ft in order to make an altitude crossing restr. Reporter first officer cites a delayed clearance and flight crew behavior fatigue was contributory.

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Attributes
ACN	349350
Time
Date	199610
Day	Fri
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 9000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : ord tracon : dfw
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp
Experience	flight time last 90 days : 210 flight time total : 8500 flight time type : 800
ASRS Report	349350
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : published procedure non adherence : far other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While on descent into chicago class B airspace, the captain (PF), went below 10000 ft MSL, leveled off at 9000 ft MSL, before indicated airspeed was reduced from 325 KTS to 250 KTS. We were in a steep descent gradient to make an unplanned ATC crossing restr, while my head was down looking at approach charts the airplane went below 10000 ft. With the rate of descent as great as it was, it took only approximately 15 seconds to level at 9000 ft after leaving 10000 ft MSL. I believe pilot fatigue played a role in this incident due to all night flight from west coast with minimal rest at hotel before departure.

Original NASA ASRS Text

Title: SPD DEV WHEN ARR B737-300 CREW EXCEEDS THE 250 KTS BELOW 10000 FT IN ORDER TO MAKE AN ALT XING RESTR. RPTR FO CITES A DELAYED CLRNC AND FLC BEHAVIOR FATIGUE WAS CONTRIBUTORY.

Narrative: WHILE ON DSCNT INTO CHICAGO CLASS B AIRSPACE, THE CAPT (PF), WENT BELOW 10000 FT MSL, LEVELED OFF AT 9000 FT MSL, BEFORE INDICATED AIRSPD WAS REDUCED FROM 325 KTS TO 250 KTS. WE WERE IN A STEEP DSCNT GRADIENT TO MAKE AN UNPLANNED ATC XING RESTR, WHILE MY HEAD WAS DOWN LOOKING AT APCH CHARTS THE AIRPLANE WENT BELOW 10000 FT. WITH THE RATE OF DSCNT AS GREAT AS IT WAS, IT TOOK ONLY APPROX 15 SECONDS TO LEVEL AT 9000 FT AFTER LEAVING 10000 FT MSL. I BELIEVE PLT FATIGUE PLAYED A ROLE IN THIS INCIDENT DUE TO ALL NIGHT FLT FROM WEST COAST WITH MINIMAL REST AT HOTEL BEFORE DEP.

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.