What is the operational temperature range for wing de-icing boots?

• A. -40C to +40C
• B. -20C to +40C
• C. -40C to +50C
• D. 0C to +40C

Answer: (A)

Wing de-icing boots rely on the rubber’s elasticity to inflate and deform the leading edge enough to break ice. Temperature affects how flexible that rubber stays and how well it stays bonded to the wing. In very cold conditions, the rubber becomes stiff, reducing its ability to seal, flex, and shear ice effectively. In very hot conditions, the material can soften or the bonds can weaken, leading to reduced performance or possible delamination. Designers specify a safe operating window where the boot maintains the necessary elasticity and bond integrity for reliable ice removal. That window is roughly -40°C to +40°C, which covers the typical range you’d encounter in standard operation. Staying within this range helps ensure the system will inflate, deflate, and shed ice as intended, without undue wear or failure.