Which altitude is applicable to the base of the outer circle in a given airspace diagram?

The altitude applicable to the base of the outer circle in the airspace diagram is 1,200 feet AGL. This is the standard height that is often used for Class E airspace designation, particularly when discussing the transition from surface-based operations to higher altitudes.

Understanding the structure of airspace is critical for flight operations and safety. The outer circle typically represents the boundaries of controlled airspace, and the specified altitude provides pilots and dispatchers with essential information about where they can expect to operate in a regulated environment.

Additionally, this height aligns well with the Federal Aviation Administration (FAA) regulations that specify the beginning of certain airspace classifications. It’s important for those involved in flight planning and dispatching to be aware of these altitudinal limits for optimal route planning and compliance with airspace designations.

Having this knowledge aids in situational awareness for pilots, ensuring effective communication and coordination while operating within different layers of airspace.