Narrative:

We were assigned to cross ramms intersection at FL210, 280 KTS. After ramms, we were switched to a different controller who told us to descend to 13000 ft. Due to moderate turbulence, we began to slow to 250 KTS at approximately 16500 ft in order to comply with turbulence penetration speeds below 15000 ft in accordance with the flight manual. Approaching 13000 ft, we were told to maintain 250 KTS. We informed the controller that we were already maintaining 250 KTS and he informed us that this was a speed deviation that should have been reported. At no time were we given instructions to maintain 280 KTS until further advised. The only clearance issued was cross ramms at FL210 and 280 KTS, and then the descent to 13000 ft. My concern is that there is a possible disconnect between what the controller is expecting and what we are expecting. If the controller is correct then I can envision a scenario of being 5-7 mi from the FAF at 280 KTS with a clean airplane because the controller didn't bother to slow me down. I don't know where the disconnect occurred in this scenario.

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Original NASA ASRS Text

Title: A DSNDING B757-200 FLT CREW IS ADVISED OF A SPD DEV BY ZDV CTLR AFTER THEY HAVE SLOWED FROM AN ASSIGNED 280 KTS TO 250 KTS FOR ANTICIPATED TURB PENETRATION AT 15000 FT IN THE AREA OF DEN, CO.

Narrative: WE WERE ASSIGNED TO CROSS RAMMS INTXN AT FL210, 280 KTS. AFTER RAMMS, WE WERE SWITCHED TO A DIFFERENT CTLR WHO TOLD US TO DSND TO 13000 FT. DUE TO MODERATE TURB, WE BEGAN TO SLOW TO 250 KTS AT APPROX 16500 FT IN ORDER TO COMPLY WITH TURB PENETRATION SPDS BELOW 15000 FT IN ACCORDANCE WITH THE FLT MANUAL. APCHING 13000 FT, WE WERE TOLD TO MAINTAIN 250 KTS. WE INFORMED THE CTLR THAT WE WERE ALREADY MAINTAINING 250 KTS AND HE INFORMED US THAT THIS WAS A SPD DEV THAT SHOULD HAVE BEEN RPTED. AT NO TIME WERE WE GIVEN INSTRUCTIONS TO MAINTAIN 280 KTS UNTIL FURTHER ADVISED. THE ONLY CLRNC ISSUED WAS CROSS RAMMS AT FL210 AND 280 KTS, AND THEN THE DSCNT TO 13000 FT. MY CONCERN IS THAT THERE IS A POSSIBLE DISCONNECT BTWN WHAT THE CTLR IS EXPECTING AND WHAT WE ARE EXPECTING. IF THE CTLR IS CORRECT THEN I CAN ENVISION A SCENARIO OF BEING 5-7 MI FROM THE FAF AT 280 KTS WITH A CLEAN AIRPLANE BECAUSE THE CTLR DIDN'T BOTHER TO SLOW ME DOWN. I DON'T KNOW WHERE THE DISCONNECT OCCURRED IN THIS SCENARIO.

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.