Definition
Aircraft equipment designed to prevent ice from forming on critical surfaces, or to remove ice that has already formed. These systems typically protect the wing leading edges, tail surfaces, propellers, windshield, pitot tube, static ports, fuel vents, and engine inlets. They fall into two general categories: anti-ice systems, which prevent ice from forming, and de-ice systems, which remove ice after it has accumulated.
Plain English
Equipment on the aircraft that stops ice from forming on important parts, or breaks off ice that has already built up.
Context Anchor
Seen in instrument flying, aircraft equipment discussions, icing procedures, and the aircraft manual when deciding whether the airplane can be flown in possible icing conditions.
Derivation
Ice comes from Old English words for frozen water. Protection comes from a Latin word meaning to cover or guard in front. System comes from a Greek word meaning things placed together. Together, the phrase points to a group of aircraft parts that guard the airplane against frozen buildup.
Why Pilots Care
Uncontrolled ice changes wing shape, reduces lift, and can cause engine problems or control loss; these systems let pilots operate safely when icing conditions cannot be avoided.
Grounding Statement
If an airplane enters freezing cloud, ice protection systems are the equipment that helps keep critical surfaces and openings from becoming coated with ice.
Intuition Check
Do not assume ice protection systems make an aircraft safe in all icing conditions. Some systems prevent ice, some remove ice, and the aircraft manual still controls what icing conditions the airplane is approved to fly in.
Example Sentence 1
Before departing into forecast icing, the pilot reviewed the aircraft's ice protection systems and confirmed each one was operational.
Example Sentence 2
During the preflight, the instructor verified that all ice protection systems were functioning before approving the winter training flight.