What is the normal operating speed limitation for aircraft as specified by the FAA?

The normal operating speed limitation for aircraft, as specified by the FAA, is crucial for maintaining safety and operational efficiency during flight. In the context of the options provided, the choice of 260 knots is indicative of the maximum indicated airspeed that aircraft should not exceed in certain flight conditions, especially when operating under instrument flight rules (IFR) in controlled airspace.

This speed limitation is primarily designed to ensure that pilots can effectively operate their aircraft without entering flight regimes that could lead to dangerous situations such as exceeding the aircraft's structural limits or entering wake turbulence zones created by larger aircraft. It helps maintain safe separation and maneuverability, particularly in busy air traffic environments.

In the context of operational regulations, the FAA sets these speed limits to enhance safety. While the other speeds provided may be relevant in different contexts or for specific aircraft types, 260 knots serves as a standard maximum speed for normal operations across a broad spectrum of aircraft types during various phases of flight, particularly below 10,000 feet in controlled airspace.