What is the maximum allowable RPM for the C172S Nav III?

The correct answer, 2700 RPM, represents the maximum allowable engine speed for the Cessna 172S equipped with the Nav III system. This RPM is crucial because it ensures that the engine operates within its design limits, preventing excessive wear or potential damage that can occur at higher RPMs. In general, the manufacturer specifies this maximum RPM to optimize engine performance and reliability while ensuring safety.

Operating the engine at or below this maximum RPM allows for efficient power output while preserving the engine's longevity. Exceeding this limit can lead to increased engine temperatures, potential mechanical failures, and could void warranties or lead to safety issues during flight. Hence, understanding this limit is vital for safe piloting and proper aircraft operation.