Narrative:

We were being vectored for the ILS runway 24 to cgf airport. It was a clear, but dark night, so we elected to fly the ILS instead of taking a visual approach. We were level at 4000 ft at 250 KTS. The controller gave us a vector for our base leg and told us to maintain 3000 ft and to fly '190 KTS or less.' the captain began to descend to 3000 ft while slowing to 190 KTS. The approach and landing were uneventful. After landing I looked at the low altitude chart, again, and discovered that below 4000 ft, we were under the floor of the cleveland class B airspace. We should have been at 200 KTS or less before descending to 3000 ft. I don't know if the controller's speed instructions were for separation purposes or if he recognized that we were well above the maximum speed for operating under the floor of the class B. The controller never said another word about our speed and never asked us what we were indicating as we left 4000 ft for 3000 ft. We are usually careful and watch for this, but were caught off guard being at a new airport and at night. In the future, we will be 'heads up' to this.

Related reports:

Google
 

Original NASA ASRS Text

Title: A FALCON 50 FO RPTED THAT HE AND THE CAPT EXCEEDED 200 KTS BELOW CLE'S CLASS B AIRSPACE.

Narrative: WE WERE BEING VECTORED FOR THE ILS RWY 24 TO CGF ARPT. IT WAS A CLR, BUT DARK NIGHT, SO WE ELECTED TO FLY THE ILS INSTEAD OF TAKING A VISUAL APCH. WE WERE LEVEL AT 4000 FT AT 250 KTS. THE CTLR GAVE US A VECTOR FOR OUR BASE LEG AND TOLD US TO MAINTAIN 3000 FT AND TO FLY '190 KTS OR LESS.' THE CAPT BEGAN TO DSND TO 3000 FT WHILE SLOWING TO 190 KTS. THE APCH AND LNDG WERE UNEVENTFUL. AFTER LNDG I LOOKED AT THE LOW ALT CHART, AGAIN, AND DISCOVERED THAT BELOW 4000 FT, WE WERE UNDER THE FLOOR OF THE CLEVELAND CLASS B AIRSPACE. WE SHOULD HAVE BEEN AT 200 KTS OR LESS BEFORE DSNDING TO 3000 FT. I DON'T KNOW IF THE CTLR'S SPD INSTRUCTIONS WERE FOR SEPARATION PURPOSES OR IF HE RECOGNIZED THAT WE WERE WELL ABOVE THE MAX SPD FOR OPERATING UNDER THE FLOOR OF THE CLASS B. THE CTLR NEVER SAID ANOTHER WORD ABOUT OUR SPD AND NEVER ASKED US WHAT WE WERE INDICATING AS WE LEFT 4000 FT FOR 3000 FT. WE ARE USUALLY CAREFUL AND WATCH FOR THIS, BUT WERE CAUGHT OFF GUARD BEING AT A NEW ARPT AND AT NIGHT. IN THE FUTURE, WE WILL BE 'HEADS UP' TO THIS.

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.