Air carrier captain reported an airspeed deviation during arrival to mco while on the cwrld 4.

Attributes
ACN	1706870
Time
Date	201912
Local Time Of Day	1201-1800
Place
Locale Reference	MCO.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	STAR CWRLD 4
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 349 Flight Crew Type 9000
Events
Anomaly	ATC Issue All Types Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Speed All Types

Narrative:

Cwrld 4 arrival to mco runway 17L. Two miles prior to lamma vectored heading 180 and descend to 8;000 feet. Heading select 180 and level change at 250 knots. Vector 200 and descent 4;000 feet. We asked for a descent due to being slightly high. ATC responded; 'unable;' due to airspace. I slowed to 210 knots to avoid being high and fast. As we slowed; ATC asked if we had slowed and not complied with the STAR. We said we slowed to 210 and then accelerated back to 250 to comply with the controller's request. Our issue is that we were vectored off the STAR prior to reaching a speed restriction point (lamma). A speed clearance was never issued by ATC; but they wanted us to maintain 250 knots. They knew our situation being high (due to requesting lower); but still expected us to remain fast. Simple clarification of required speed both from us and ATC may have prevented this.

Original NASA ASRS Text

Title: Air carrier Captain reported an airspeed deviation during arrival to MCO while on the CWRLD 4.

Narrative: CWRLD 4 Arrival to MCO RWY 17L. Two miles prior to LAMMA vectored heading 180 and descend to 8;000 feet. HDG Select 180 and Level Change at 250 knots. Vector 200 and descent 4;000 feet. We asked for a descent due to being slightly high. ATC responded; 'Unable;' due to airspace. I slowed to 210 knots to avoid being high and fast. As we slowed; ATC asked if we had slowed and not complied with the STAR. We said we slowed to 210 and then accelerated back to 250 to comply with the Controller's request. Our issue is that we were vectored off the STAR prior to reaching a speed restriction point (LAMMA). A speed clearance was never issued by ATC; but they wanted us to maintain 250 knots. They knew our situation being high (due to requesting lower); but still expected us to remain fast. Simple clarification of required speed both from us and ATC may have prevented this.

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.