What is the initial requirement for specifying the heading azimuth to be flown for aircraft departures?

The initial requirement for specifying the heading azimuth to be flown for aircraft departures is based on the intended flight path. This aligns with air traffic management practices that ensure aircraft are directed along safe and efficient routes right from the moment they take off.

When a flight is planned, the intended flight path takes into account factors such as weather conditions, airspace restrictions, and the final destination. The heading azimuth is crucial because it helps pilots navigate from the runway to the designated route, ensuring they remain on track and follow the correct departure procedures. The intended flight path is designed to optimize safety and efficiency in air travel, particularly at busy airports.

While runway orientation may play a role in the context of takeoff, it is the intended flight path that ultimately guides the departure heading. Aircraft weight and air traffic control directives can influence later stages of a flight plan but are not the primary factor in determining the initial heading.