Which document would inform pilots of temporary changes affecting aeronautical operations?

The correct answer is a Notice to Airmen (NOTAM). NOTAMs are crucial for informing pilots about temporary changes, hazards, or important information that can affect aeronautical operations. These may include runway closures, airspace restrictions, or changes in operational procedures. Pilots must be aware of NOTAMs prior to flight, as they contain essential information that ensures safety and operational efficiency in aviation.

A flight plan is primarily a document submitted to air traffic control that outlines the intended route of flight, as well as departure and arrival details. While it provides critical information about the flight, it does not convey real-time updates about temporary changes like NOTAMs do.

A technical manual typically contains detailed information and instructions about the specifications and operation of an aircraft, but it does not provide updates on temporary aeronautical changes.

A weather briefing offers critical weather information which is essential for flight planning and safety but does not include notifications about temporary changes to aeronautical operations. Thus, while weather conditions are vital for pilots, they are not a source for reporting immediate operational updates like NOTAMs.