In which document can you find information regarding two-way radio failure?

The correct choice for finding information regarding two-way radio failure is the Flight Information Handbook (FIH). This document is specifically designed to provide pilots with critical information on various operational issues, including emergencies such as radio failures. The FIH includes procedures and guidelines for pilots to follow in the event of communication difficulties, ensuring they can manage situations effectively while maintaining safety.

In contrast, the other documents serve different purposes. The Flight Operations Manual (FOM) typically outlines the procedures and policies specific to an airline or operator, which may not focus solely on radio failure protocols. The Aeronautical Information Manual (AIM) provides a broad range of information related to aviation rules, regulations, and operational practices but does not consolidate emergency procedures specifically like those related to radio failures. The Pilot's Handbook of Aeronautical Knowledge offers fundamental knowledge essential for flight, but it does not go into detail about emergency procedures and situations like the FIH does. This distinction makes the FIH the most relevant source for information regarding two-way radio failures.