terms of this Agreement; "Export-Gertirmate-of-Ainvorthinessmeans-a-stanclardr esnt-expect-Geftifisate-of aifwecthineserfor the Aircraft issued by Aviation Authority of-the State of Registry valid for a pecied-ef-at-leas.4-44Pfr(30)-days-from-Delivepfrwith-seeh-emeeptiencrer-limitatimis-Ets-mity-be mquired-by-Aviatien-Authefit -the-Stat