COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Propellers - Variable Pitch - Hamilton Standard AD/PHS/2 Amdt 1 Model 23260, 43E-60 and 43D-50 Reverse Solenoid Valve - Modification 6/66 Applicability: All model 23260, 43E60 and 43D50 propellers. Requirement: Remove Hamilton Standard Model 67000 reverse solenoid valves and replace with approved, redesigned valves. Compliance: Before installation in an aircraft after 28 July 1968.