Where is one PDI located in the HSC-3 aircraft?

The PDI, or Pilot Display Interface, is an essential component in the HSC-3 aircraft that interfaces directly with the pilot to provide critical information about the aircraft's systems. By specifying that it is located on the pilot assist module, it highlights the importance of this area as a hub for displaying and analyzing various flight data that assists the pilot in operational decision-making.

The pilot assist module plays a crucial role in enhancing situational awareness by providing vital indicators related to navigation, engine performance, and other flight-critical information. This integration helps ensure the pilot has immediate access to data that is essential for safe flight operations.

In contrast, locations such as the main rotor head, tail rotor, and gearbox are primarily mechanical components focused on the aircraft's movement and stability. While they are vital for the aircraft's operations, they do not house the electronic interfaces that deliver direct information to the pilot. Therefore, the pilot assist module is accurately recognized as the location of one PDI in the HSC-3 aircraft.