Under icing conditions, helicopter rotor is prone to icing.The rotor icing menaces the safety of the helicopter seriously, so the blade must be protected from icing.

• 摘要直升机主旋翼桨叶在结冰气象条件下有结冰的危险，为了满足直升机全天候仪表飞行的要求，必须对桨叶采取结冰防护。