Critical Ice Shape: The aircraft surface ice shape formed within required icing conditions. It results in the most adverse effects for specific flight safety requirements. For an aircraft surface, the critical ice shape may differ for different requirements (for example, stall speed, climb, aircraft controllability, control surface movement, control forces, air data system performance, dynamic pressure probes for control force “feel” adjustment, ingestion and structural damage from shed-ice, engine thrust, engine control, and aeroelastic stability)
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