What does a block diagram primarily illustrate in terms of aviation systems?

A block diagram is a simplified representation that visualizes the relationships between different components and the flow of operations within a system. In the context of aviation systems, it helps illustrate how various subsystems interact, providing a clear picture of the processes involved from start to finish. By outlining the sequence and interaction of components, such diagrams facilitate understanding and help in troubleshooting, system design, and operational planning.

This focus on operational flow distinguishes it from other aspects such as structural integrity, safety protocols, or fuel efficiency, which do not primarily address the interactions and operations between system components in the same way that a block diagram does. Thus, recognizing a block diagram's role in depicting operational relationships is crucial for comprehending complex aviation systems effectively.