Read the following passage:
Modern aircraft rely on pitot-static systems to measure airspeed, altitude, and vertical speed by sampling external ambient and dynamic air pressures. During flight through freezing moisture or sub-zero cloud layers, ice accumulation can rapidly obstruct the narrow pitot tube opening, causing the airspeed indicator to give dangerously erroneous readings or drop to zero. To prevent this hazard, pilots engage electrical heating elements embedded directly inside the probe before entering icing conditions. Rather than serving as a de-icing mechanism to clear heavy existing ice, the primary operational doctrine of pitot heat is anti-icing—maintaining a surface temperature above freezing so that ice crystals never form in the first place.
Statement: The author's primary purpose in writing this passage is to explain that pitot heat is designed as a proactive preventive measure rather than a reactive clearing tool.
Answer: Answer