COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Douglas DC4 Series Aeroplanes AD/DC4/31 Propeller Feathering System - Modification NK Applicability: All models. Requirement: Replace the existing flexible hose components of the propeller feathering lines forward of the firewall with hose assemblies having greater fire resistance. The following hose assemblies are acceptable for this application: Resistoflex P/N SSFR-3800-10 Aeroquip P/N 304000 (680-10S with 304 sleeves over end fittings) Aeroquip P/N 309009-10S or -8S; or Note: Flexible hose assemblies located forward of the cylinders and connecting to the governor are not affected by this Order. FAA AD 55-15-3; or ANO 105.1.16.2.5.31.