COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Turbomeca Turbine Engines - Turmo Series AD/TURMO/4 Fuel Control - Acceleration Unit 10/92 Applicability: All Turmo IV A, B, C, CA and CB engines. Requirement: Unless previously carried out, action in accordance with Turbomeca Service Bulletin No 088. Note: DGAC AD 92-115(B) refers. Compliance: Prior to 30 September 1992. Background: In certain operating conditions the vibratory torsion modes between the gearbox and engine could damage both engine flexible couplings.