Fatigue during ice rescue is six hours under which conditions?

• A. Wind less than 30 knots, temperature above 10°C, transiting thick ice
• B. Winds >30 knots
• C. Temperature below 0°C
• D. Not applicable

Answer: (A)

The main idea is that the six-hour fatigue allowance for ice rescue is tied to relatively mild environmental conditions. When winds stay under 30 knots, the air temperature is above 10°C, and you’re transiting thick ice, cold stress and wind chill are less punishing, the ice surface is more stable to move on, and physical work is less exhausting. Those factors together make it practical to plan for up to six hours of continuous effort with appropriate rotations.

If winds were higher, cold temperatures were involved, or you were dealing with less stable ice, fatigue would set in more quickly, reducing how long a team can safely work without a break. Not applicable isn’t a realistic scenario for this context.