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Airworthiness Directives; Harbin Aircraft Manufacturing Corporation Model Y12 IV Airplanes

Unsafe Condition: Reports of in-flight incidents and an accident in icing conditions where the airframe pneumatic deicing boots were not activated, leading to reduced controllability due to ice accumulation.

Why matched: Airworthiness Directives; Harbin Aircraft Manufacturing Corporation Model Y12 IV Airplanes

Airworthiness Directives; Harbin Aircraft Manufacturing Corporation Model Y12 IV Airplanes

Unsafe Condition: Operating in severe icing conditions outside the certification envelope may lead to potential hazards due to inadequate flight crew information on recognition and exit procedures.

Why matched: Airworthiness Directives; Harbin Aircraft Manufacturing Corporation Model Y12 IV Airplanes