Which tool is commonly used for planning flight routes in helicopters?

The most commonly used tool for planning flight routes in helicopters is flight planning software or aeronautical charts. Flight planning software provides a comprehensive and user-friendly interface that pilots can utilize to create detailed flight plans, taking into account various factors such as airspace restrictions, waypoints, and terrain. This software often includes features for calculating fuel requirements, estimating flight time, and evaluating alternative routes based on real-time data.

Aeronautical charts complement this software by offering essential information, such as topographical details, controlled airspace boundaries, and navigational aids. These charts are crucial when visualizing the flight path and understanding the surrounding environment, which helps ensure safety and efficiency during the flight.

Other options, like weather forecast services, while important for flight safety and planning, are not tools used specifically for route planning. Similarly, maintenance checklists pertain to aircraft readiness rather than planning routes, and width and height measure tools do not directly assist in navigating or planning a helicopter flight path. Therefore, the combination of flight planning software and aeronautical charts is key in establishing effective and safe flight routes.