COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Percival Proctor Series Aeroplanes AD/PROCTOR/1 Amdt 1 (Re-Issue) Wing Rib to Aileron Spar Joint - Inspection 9/67 Applicability: All Mk. I, Mk. II and Mk. III not modified in accordance with Percival Mods. Nos. 130 or 590 as appropriate. Requirement: 1. Inspect the points of attachment of the outer wing ribs to the aileron false spar. 2. If the areas show signs of faulty gluing or failure of joints, strengthen the rib to spar attachment in accordance with Proctor Modifications Nos. 130(Mk. I) and 590 (Mk's II and III), or DCA/PROCTOR/1A, or A.N.O. 105.1.26.0.2.1 Compliance: At intervals not exceeding 12 months or 100 hours time in service, whichever occurs first.