nihiness cerl'kale Ise什ective as long as the maintenance ．preventat e maintenance, and alle藺o鷓are perlorrned in accordance with Parts21．43．. d91 of theFederalAviatio fifiequ • lions,as appropriate, and the aircraft is registered in the United States, DATE OF ISSUANCE DESIGNATION NUMBER 可 璁囔鋤囤7 Any alteration,