COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Propeller Governors AD/GOV/6 Governor Pressure Relief Valve Roll Pin - Modification 8/79 Applicability: All McCauley governors model C290D3/T(), C290D4/T(), CF() () 310D2/T(), ()CF()S31D3/T(), DCF()S310D4/T(), DCF()S290D4/T(), DCF() ()290D2/T(), DCF()S290D5/T(). Note: Production governors already incorporating this modification will have a letter "A" in the model number- e.g. C290D3A/T6, while field modified governors will have the suffix letter "A" to the serial number. Document: McCauley SB No. 116. Compliance: Before installation on an aircraft following the next reconditioning after 31 August 1979.