Definition
Inflatable rubber-like coverings, called deicing boots, bonded to the leading edges of wings and tail surfaces. When activated, they expand and contract with pressurized air to break off ice that has formed on the leading edge, then deflate so the surface returns to its normal aerodynamic shape.
Plain English
Stretchy rubber strips along the front edges of the wings and tail. They puff up to crack ice off, then go flat again so the wing flies normally.
Context Anchor
Seen in discussions of ice protection on outer wing surfaces and the tail section, especially during preflight checks and flight in freezing moisture.
Derivation
Called 'boots' because, like a rubber boot worn over a shoe, they are a flexible rubber covering fitted over the leading edge of the wing or tail. The name describes the shape and material, not a function.
Why Pilots Care
Ice on the wings destroys lift and can force an immediate diversion or landing; boots let the pilot remove that ice in flight without needing to exit icing conditions immediately.
Grounding Statement
Picture a rubber sleeve on the front edge of the wing briefly swelling to pop ice loose.
Intuition Check
Do not read boots as footwear here. In this aircraft context, boots are inflatable rubber ice-removal covers on the wing or tail.
Example Sentence 1
After picking up ice in the climb, the pilot turned on the boots and watched the leading edges inflate to shed the buildup.
Example Sentence 2
During the preflight inspection the pilot checked the boots for cracks and confirmed they inflated properly on the test switch.