Flight crew descended below 10000 ft MSL and reduced airspeed to 200 KTS. ARTCC informed flight crew they had been assigned 250 KTS that the pilots were unable to recall being assigned.

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Attributes
ACN	431930
Time
Date	199903
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zau.artcc
State Reference	IL
Altitude	msl single value : 10000
Environment
Flight Conditions	VMC VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau.artcc
Operator	common carrier : air carrier
Make Model Name	Challenger CL604
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : cfi pilot : multi engine
Experience	flight time last 90 days : 116 flight time total : 1575 flight time type : 415
ASRS Report	431930
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance other anomaly
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : returned to original clearance
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Ambiguous

Narrative:

We were assigned a descent to maintain an altitude below 10000 ft. We descended and slowed to 250 KIAS at 10000 ft and then to 200 KIAS as we neared our assigned altitude. At that point ARTCC queried our airspeed and told us to maintain 250 KIAS because that was the speed that had been assigned. Both the captain and I had no recollection of the '250 KIAS assigned.' I was handling the radios and never read back any assigned airspeed. We accelerated to 250 KIAS at that point. Obviously there was a breakdown in communication somewhere along the line.

Original NASA ASRS Text

Title: FLC DSNDED BELOW 10000 FT MSL AND REDUCED AIRSPD TO 200 KTS. ARTCC INFORMED FLC THEY HAD BEEN ASSIGNED 250 KTS THAT THE PLTS WERE UNABLE TO RECALL BEING ASSIGNED.

Narrative: WE WERE ASSIGNED A DSCNT TO MAINTAIN AN ALT BELOW 10000 FT. WE DSNDED AND SLOWED TO 250 KIAS AT 10000 FT AND THEN TO 200 KIAS AS WE NEARED OUR ASSIGNED ALT. AT THAT POINT ARTCC QUERIED OUR AIRSPD AND TOLD US TO MAINTAIN 250 KIAS BECAUSE THAT WAS THE SPD THAT HAD BEEN ASSIGNED. BOTH THE CAPT AND I HAD NO RECOLLECTION OF THE '250 KIAS ASSIGNED.' I WAS HANDLING THE RADIOS AND NEVER READ BACK ANY ASSIGNED AIRSPD. WE ACCELERATED TO 250 KIAS AT THAT POINT. OBVIOUSLY THERE WAS A BREAKDOWN IN COM SOMEWHERE ALONG THE LINE.

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.