What is the purpose of an anti-ice system for the pitot tube?

• A. To prevent ice from forming in icing conditions, which would block the ports and impair readings.
• B. To prevent pitot tube overheating.
• C. To maintain cabin humidity.
• D. To aid engine start.

Answer: (A)

In icing conditions, keeping the pitot tube from freezing is essential because ice can form on or inside the tube and block the small pressure ports that feed the airspeed indicator. If those ports are blocked, the instrument can give incorrect or unreliable readings, which is dangerous for maintaining proper airspeed. The anti-ice system for the pitot tube provides heat to the tube and its ports to prevent ice buildup and keep the readings accurate. It isn’t about overheating equipment, cabin humidity, or starting the engine, so those options aren’t relevant here.