Maximum temperature for operation of WING ICE protection is?

Maximum temperature for operation of WING ICE protection is?

• A. 25 C
• B. 10 C
• C. 20 C
• D. 15 C

Answer: (D)

Wing ice protection is used only when there’s a real risk of ice forming on the wing leading edges, which occurs in icing-prone conditions but not at higher temperatures. The system has a defined upper limit for operation, set at 15 C. If the outside air is warmer than 15 C, icing is unlikely enough that turning the protection on isn’t necessary and would waste power and add wear. So 15 C is the maximum temperature for operating wing ice protection. Choices that are higher than this would exceed the permissible envelope, since icing risk is negligible above that point, and choosing a lower value isn’t about the actual limit—it would just understate the true maximum.

Wing ice protection is used only when there’s a real risk of ice forming on the wing leading edges, which occurs in icing-prone conditions but not at higher temperatures. The system has a defined upper limit for operation, set at 15 C. If the outside air is warmer than 15 C, icing is unlikely enough that turning the protection on isn’t necessary and would waste power and add wear. So 15 C is the maximum temperature for operating wing ice protection.

Choices that are higher than this would exceed the permissible envelope, since icing risk is negligible above that point, and choosing a lower value isn’t about the actual limit—it would just understate the true maximum.