COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Agusta A109 Series Helicopters AD/A109/27 Tail Rotor Blades P/N 109-8132-01-107 7/97 DM Applicability: Model A109C with tail rotor blades Part Number 109-8132-01-107 with Serial Numbers prefixed A5- installed. Requirement: Action in accordance with Agusta Bullettino Technico 109-105. Note: RAI AD 97-090 refers. Compliance: Within 25 hours time in Service after 12 May 1997. This Airworthiness Directive becomes effective on 12 May 1997. Background: This Directive is raised to inspect the bonding of the tail rotor blades tip fairing for voids and disbonding. Loss of a tip fairing will cause severe vibration, and may cause severe structural damage that may result in loss of control.