When taking off/landing in areas of suspected windshear, by how many knots should rotation and approach speeds be increased?

Increasing rotation and approach speeds by 10 knots in areas of suspected windshear is a critical safety measure that helps ensure a safe takeoff and landing. Windshear can cause sudden changes in wind speed and direction, which can significantly affect aircraft performance during the most critical phases of flight.

By increasing these speeds, the aircraft has a larger margin of safety to maintain controllability and avoid potential stall conditions. The 10-knot increase strikes a practical balance; it is substantial enough to account for typical windshear effects while remaining manageable for pilots, allowing them to maintain the normal operating envelope of the aircraft. This adjustment helps pilots respond effectively to the unsteady airmasses they might encounter.

In contrast, options suggesting a 5, 15, or 20-knot increase may not provide the necessary buffer against windshear. A minimal increase like 5 knots may not be sufficient in challenging conditions, while a 15 or 20-knot increment could lead to operational challenges and handling difficulties, deviating from typical performance parameters. The decision to recommend a 10-knot increase aligns best with established safety practices and operational guidelines for aircraft in windshear situations.