What is the approach speed with a boot failure, when ice is on the airframe?

The approach speed in the event of a boot failure while ice is present on the airframe is set at 130 knots. This speed is critical as it ensures that the aircraft maintains adequate control and performance despite the additional drag and potential stall characteristics introduced by ice accumulation.

When ice forms on the airframe, it alters the aerodynamic characteristics of the aircraft, leading to increased stall speeds and potential control difficulties. The specified approach speed is designed to compensate for these changes, ensuring that the pilots have a safety margin that helps maintain controlled flight as they approach for landing.

Additionally, the operational guidelines often recommend increasing approach speeds in icing conditions to account for these factors. The selection of 130 knots as the approach speed is a balance between safety and operational efficiency, providing the pilot with the necessary control while managing potential performance degradation due to ice.