COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Agusta A109 Series Helicopters AD/A109/9 Engine Mount Installation 6/87 Applicability: All models A109A and A109AII up to and including S/N 7361 except S/N 7359. Requirement: Action in accordance with Bollettino Tecnico 109-61 Part I and Part II. Compliance: Within 100 hours' time in service after 4 June 1987 or at the next scheduled inspection for Maintenance Release issue after 4 June 1987, whichever is later. Note: RAI AD 87-43/109-42 refers. Background: Chafing of an oil scavenge line against a mount leg has initiated corrosion which has in one case penetrated through the tubing.