What is the maximum tailwind allowed for engine start?

The maximum tailwind allowed for engine start on the Dassault Falcon 7X is 15 knots. This restriction is in place to ensure safety during the engine start sequence. A stronger tailwind can affect the airflow around the aircraft and potentially lead to engine performance issues or insufficient airflow for the engines to start effectively. By limiting the tailwind to 15 knots, the design allows for more controlled conditions, ensuring optimal performance and reducing the risk of complications during the critical phase of starting the engines.

Other options indicate higher tailwind limits, which could compromise safety standards set by the manufacturer and aviation regulations, emphasizing the importance of adhering to the specified limits to maintain safe operational practices.