How do pilots determine the best glide speed in a multi-engine aircraft?

The best glide speed for a multi-engine aircraft is primarily determined by referencing the aircraft's Pilot Operating Handbook (POH). The POH provides critical information specific to the aircraft, including performance data such as optimal speeds for various phases of flight, including glide speed. This speed is essential for maximizing the distance the aircraft can travel while descending, especially in the event of an engine failure.

The POH is created based on extensive testing and is tailored to the specific aircraft design, ensuring that the pilot has a reliable source of information to reference in both normal and emergency situations. Following the guidelines established in the POH enhances flight safety and performance by ensuring that pilots operate within the aircraft's optimal performance parameters.

While a pilot's experience can certainly inform their decision-making, it is not as reliable as the standardized data provided in the POH. Visual cues may assist pilots in some operational contexts, but they do not provide the precise information needed for calculating glide speed. Consulting air traffic control is typically reserved for navigation and traffic separation and does not contribute to determining the aircraft's best glide speed.