In icing conditions, speeds at or below which value should Wing and Stabilizer be ON?

• A. 170 kts
• B. 190 kts
• C. 180 kts
• D. 200 kts

Answer: (B)

In icing conditions, you protect the wings and stabilizer from ice buildup by keeping the anti-ice system active whenever you’re operating at speeds where ice can readily form and affect performance. For this aircraft, the guideline is to have Wing and Stabilizer anti-ice ON at speeds at or below 190 knots. This protects the airfoil surfaces during the slower, icing-prone phases of flight—like climb, descent, and approach—when ice accumulation is most likely. At speeds above 190 knots, the requirement isn’t triggered, so anti-ice can be left off if icing conditions aren’t present, which helps reduce drag. The other options would set the activation threshold in a way that doesn’t align with the standard operating procedure, either keeping anti-ice on too early or missing protection during the critical lower-speed regime.