In which airspace class is the 250 kt IAS speed limit applicable below 10,000 ft AMSL?

The 250 knots indicated airspeed (IAS) speed limit below 10,000 feet Above Mean Sea Level (AMSL) applies universally to several classes of airspace, specifically Classes C, D, E, F, and G. This regulation is established to enhance safety and ensure efficient traffic management within controlled and uncontrolled airspace.

In Class C airspace, the presence of an approach control service necessitates speed restrictions to alleviate congestion and maintain orderly traffic flow. Class D airspace, typically near airports with control towers, similarly requires a speed limit to improve safety near high-density traffic areas.

Class E airspace, where the airspace is generally less controlled, still adheres to this speed limitation due to potential interactions with other aircraft, especially as they transition to or from higher elevations. Although Classes F and G are uncontrolled, the imposition of this speed limit enhances safety and situational awareness for all pilots operating below 10,000 feet, thus preventing conflicts or collisions during crucial phases of flight.

Overall, the application of the 250 kt IAS speed limit below 10,000 feet AMSL across these classes serves a critical role in the management of air traffic safety and efficiency, making the selected answer the most accurate.