Definition
A regulatory and equipment requirement that any flight instruments, sensors, and air-data probes used for instrument flight (such as the pitot tube, static ports, and outside air temperature probe) must be protected from ice formation, typically by electrical heating elements that prevent or remove ice buildup during flight in visible moisture at or below freezing temperatures.
Plain English
The instruments a pilot relies on when flying in cloud or low visibility need to be kept ice-free, because ice on a sensor or probe can give false readings or block the instrument completely. This is normally done with built-in heaters.
Context Anchor
Seen in helicopter IFR equipment and certification requirements, especially when checking the approved flight manual before IFR flight in freezing clouds, rain, snow, or mist.
Why Pilots Care
Prevents loss of critical instrument data that could lead to loss of control in icing conditions during IFR helicopter flight.
Grounding Statement
In cold, wet air, ice can build on small sensors and exposed parts quickly, even before the pilot sees much ice on the rest of the helicopter.
Intuition Check
Ice protection here does not mean the whole helicopter is automatically safe or legal for flight in icing. It means the IFR-required systems have approved protection so they can keep working when ice could affect them.
Example Sentence 1
Before launching into the overcast, the pilot turned on pitot heat as part of the ice protection of IFR systems checklist item.
Example Sentence 2
During the preflight check the mechanic inspected the ice protection of IFR systems on the helicopter.