B737-800 captain reported slowing below an ATC-assigned speed on arrival into den.

Attributes
ACN	1645096
Time
Date	201905
Local Time Of Day	1201-1800
Place
Locale Reference	DEN.Airport
State Reference	CO
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 346 Flight Crew Type 346
Events
Anomaly	Deviation - Procedural Clearance Deviation - Speed All Types Inflight Event / Encounter Weather / Turbulence

Narrative:

On kohoe 3 arrival; descend via clearance; initially controller said delete speed restrictions; then said maintain 280 knots with no fix limit on the speed. We were given; 'expect RNAV Z runway 35R.' the start of the RNAV is at doggg (11;000'/maximum 210 KIAS). Around dhatt we entered light turbulence. Because we needed to lose a minimum of 70 knots; we started slowing and descending (energy management). At 260 knots the controller asked our speed and we told him. The controller reminded us of the 280 knots and to advise him if the ride required a slower speed. We were able to configure in time and the approach and landing was uneventful.

Original NASA ASRS Text

Title: B737-800 Captain reported slowing below an ATC-assigned speed on arrival into DEN.

Narrative: On KOHOE 3 Arrival; descend via clearance; initially controller said delete speed restrictions; then said maintain 280 knots with no fix limit on the speed. We were given; 'expect RNAV Z Runway 35R.' The start of the RNAV is at DOGGG (11;000'/MAX 210 KIAS). Around DHATT we entered light turbulence. Because we needed to lose a minimum of 70 knots; we started slowing and descending (energy management). At 260 knots the controller asked our speed and we told him. The controller reminded us of the 280 knots and to advise him if the ride required a slower speed. We were able to configure in time and the approach and landing was uneventful.

Data retrieved from NASA's ASRS site 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.