When requesting a weather briefing, which information must the crew provide?

When requesting a weather briefing, it is essential for the crew to provide comprehensive details about their flight to ensure that they receive the most relevant and accurate weather information. The aircraft identification allows the weather briefer to confirm who they are speaking with and the specifics of the flight. Specifying the aircraft type is crucial for understanding the performance characteristics and any limitations that may affect the flight in varying weather conditions. The destination is key to obtaining weather data relevant to the intended landing area, while the proposed altitude helps the briefer assess the weather conditions that will be encountered at that altitude, including any potential turbulence or weather phenomena.

The other options do not include all the necessary details for a complete weather briefing. For instance, flight plan and aircraft weight may provide insight into the flight's operational parameters but do not directly relate to weather conditions. Similarly, personal details such as the pilot's name and number of passengers are not pertinent to obtaining weather information needed for safe flight operations. Lastly, while knowing the route and alternate airports is helpful, it is insufficient to fully inform the briefer about the critical factors that may affect the flight due to weather. This comprehensive approach to providing information ensures that the crew is well-informed and prepared for their flight.