Question

Windshield anti-ice must be on and checked for all operations except as follows: a) When visibility is good b) When temperature is above freezing c) When ice is not forecasted d) When on the ground

Answer 1

Anti-ice operations act to prevent ice formation on the windshield of aircraft, particularly in cold environments. However, it may not be necessary to activate this system when visibility is good, temperatures are above freezing, no ice is forecast, or while the aircraft is on the ground.

Step-by-step explanation:

The process of using anti-ice equipment in aircraft is considered part of their standard operations in certain weather conditions. The anti-ice system prevents the formation of ice on the windshield of the aircraft, mainly during flight in colder environments. The operation and checking of anti-ice equipment are critical, except for the following conditions:

1. When visibility is good: If visibility conditions are clear, the anti-ice system may not be as necessary.
2. When the temperature is above freezing: Anti-ice equipment is used to prevent the formation of ice, so if temperatures are above freezing, the likelihood of ice formation is significantly reduced.
3. When ice is not forecasted: If weather forecasts do not predict the formation of ice, the anti-ice system might not need to be activated.
4. When on the ground: Typically, the anti-ice system is needed when the aircraft is in flight, especially in colder altitudes, so it may not be necessary to use it while the aircraft is on the ground.

This is similar to the principle of freezing point depression that we see being exploited on roadways during winter, where solute e.g., salt is applied to lower the freezing point of the ice, causing it to melt and prevent further formation.

Learn more about Anti-ice operations