Do not operate in continuous moderate or severe icing for more than how many minutes?

• A. 15
• B. 60
• C. 30
• D. 45

Answer: (D)

When you’re in continuous moderate or severe icing, ice keeps accumulating on surfaces and can quickly overwhelm the aircraft’s anti-ice and de-ice capability, degrading lift, changing stall characteristics, and reducing control effectiveness. The limit is 45 minutes to ensure you have time to exit the icing conditions or apply corrective action before performance margins become unsafe. After reaching that duration, the safe course is to leave the icing area or follow approved procedures to de-ice/anti-ice or divert, rather than continuing in icing conditions.