COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Airconditioning Equipment AD/AIRCON/2 Godfrey Cabin Supercharger NK Type 15 - Modification Applicability: All Godfrey Cabin Superchargers Type 15. Requirement: Modify the attachment of the oil metering unit and the bearing cover plate to the cabin supercharger to provide a positive locking of the nuts to studs and studs to supercharger casing. Lockwiring of drilled studs and castellated nuts or the use of plain washers, spring washers and lockwired plain nuts are acceptable means of compliance. Compliance: Forthwith.