COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Electrical Equipment AD/ELECT/13 Amdt 2 Magneto - BTH - Slow Speed Wheel - Inspection 2/74 Applicability: BTH Type AG4. Requirement: Thoroughly inspect the teeth of the CX133241/1 Slow Speed Wheel for cracks or damage using at least a X5 magnifying glass. Remove from service any defective Slow Speed Wheels. Compliance: Before installation in an aircraft following each reconditioning completed after 28 February 1974.