What must be included in the Authority section of the aeronautical order when it is based on a letter?

In the Authority section of an aeronautical order, it is crucial to include the organization, office symbol, and date. This information provides clarity on the origin of the order, ensuring that the authority issuing the directive is clearly identified. The organization indicates which entity is responsible for the order, while the office symbol provides specific departmental identification. Including the date is essential for establishing the timeline of the order's issuance, which can be vital for understanding its validity and relevance.

This section serves to attribute the order to a recognized authority, which is necessary for its legitimacy and enforcement. By clearly stating these details, the order gains the necessary formal backing and accountability, allowing personnel to follow the commands with an understanding of their source and context.