Which of the following is NOT a type of de-icing equipment?

The correct choice indicates cargo hold heaters are not considered a type of de-icing equipment. De-icing equipment specifically addresses the removal of ice that forms on the exterior surfaces of an aircraft, particularly the wings and control surfaces, which are critical for safe flight operations.

Pito heat functions to prevent ice from forming on the pitot tube, ensuring accurate airspeed readings, which is essential for flight safety. Bleed air systems utilize hot air extracted from the engines to de-ice leading edges of wings and stabilizers, preventing ice accumulation that could compromise aerodynamic performance. Defrosters are utilized to keep windows clear of ice and snow, allowing for proper visibility during operations.

Cargo hold heaters, while they serve an important purpose in maintaining temperature conditions for cargo, are not utilized for de-icing surfaces that affect aircraft performance or safety during flight. Instead, their primary function is to prevent temperature-sensitive cargo from sustaining damage due to freezing, therefore they do not fit into the category of de-icing equipment.