Narrative:

Traversing the mia class B airspace at 4;000 feet; we were at 250 kts. Prior to penetrating the southern shelf of the airspace; over miami executive airport (class B 7000 to 5000); we slowed to 200 knots. Mia app issued clearance to maintain 250 knots. I responded unable due to being below class B; can only do 200 knots. Controller said maintain 210 [knots] or greater. I replied with clearance but we maintained 200 knots. Soon thereafter; we were once again in [class] B and accelerated to 250 knots. We switched to another approach controller and entered the northern lower shelf of B; so we slowed to 200. The new controller also gave us a clearance to accelerate to 250 or we would be number 3 for the airport. I once again replied unable due to being below class B. He asked what speed I could do; to which I said 200 [knots]. He said maintain 200 [knots] or greater. I have heard of this occurring before; but why are controllers not familiar with their airspace and fars that govern them? Twice; by two separate controllers; we were issued a clearance that was a clear violation of fars. The southern shelf above miami executive airport is probably there for local traffic. There is a reason why we should be at 200 knots instead of 250.

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Original NASA ASRS Text

Title: EMB 505 flight crew reported ATC issued clearance for speeds higher then 200 knots while below the MIA Class Bravo airspace.

Narrative: Traversing the MIA Class B airspace at 4;000 feet; we were at 250 kts. Prior to penetrating the southern shelf of the airspace; over Miami Executive Airport (Class B 7000 to 5000); we slowed to 200 knots. MIA APP issued clearance to maintain 250 knots. I responded unable due to being below Class B; can only do 200 knots. Controller said maintain 210 [knots] or greater. I replied with clearance but we maintained 200 knots. Soon thereafter; we were once again in [Class] B and accelerated to 250 knots. We switched to another Approach Controller and entered the northern lower shelf of B; so we slowed to 200. The new controller also gave us a clearance to accelerate to 250 or we would be number 3 for the airport. I once again replied unable due to being below Class B. He asked what speed I could do; to which I said 200 [knots]. He said maintain 200 [knots] or greater. I have heard of this occurring before; but why are controllers not familiar with their airspace and FARs that govern them? Twice; by two separate controllers; we were issued a clearance that was a clear violation of FARs. The southern shelf above Miami Executive Airport is probably there for local traffic. There is a reason why we should be at 200 knots instead of 250.

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.