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Ice ridges

January 15, 2023

Ice ridges

Ice ridges on the lower nose fuselage can cause Computed Airspeed (CAS) values delivered by the ADRs to be lower than the actual airspeed which may lead to unreliable airspeed events.
The main cause of ice ridges over the lower nose fuselage of the aircraft is ice accretion during a long stay on ground in cold conditions. A review of in-service events shows the large majority of ice ridges related events occurred during the first flight of the day.

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