What happens if the pitot heat is not activated while in visible moisture?

• A. Improved flight performance
• B. Increased risk of icing
• C. Enhanced passenger comfort
• D. No impact whatsoever

Answer: (B)

When the pitot heat is not activated while flying in visible moisture, the aircraft's pitot tube, which is crucial for measuring airspeed, is at risk of icing. Visible moisture refers to any form of water present in the atmosphere, such as clouds or precipitation, and when the temperature is low enough, this moisture can freeze on the surfaces of the aircraft. If the pitot tube becomes iced over, it could lead to erroneous airspeed readings or complete failure of the airspeed indicator.

This situation poses a significant safety concern because pilots rely on accurate airspeed information to maintain control of the aircraft. Therefore, not activating the pitot heat in these conditions can significantly increase the risk of icing and compromise flight safety.