What is the primary purpose of the Flight Information Handbook during radio failure?

The primary purpose of the Flight Information Handbook during a radio failure is to provide procedures for managing navigation. In situations where communication with air traffic control or other aircraft is lost, maintaining situational awareness and accurately navigating is crucial for ensuring safety. The handbook contains guidelines on how to proceed with navigational tasks using other available resources such as visual references and electronic aids, which become especially important when pilots cannot rely on verbal communications for updates or instructions.

While aspects like identifying airspeed restrictions, emergency landing instructions, and weather forecasting are important components of flight operations, they do not specifically address the procedures to be followed during a communication failure. The focus during a radio failure is on ensuring safe navigation and avoiding potential conflicts, which is why the procedures outlined in the handbook are critical.