COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Eurocopter BO 105 Series Helicopters AD/BO 105/6 Fuel Filter Drain Valve 9/86 DM Applicability: All model BO 105 helicopters fitted with engine fuel filter drain valve P/No P101- 228. Requirement: Action in accordance with MBB Alert Service Bulletin ASB BO 105-60-101. Note: German AD 86-148 MBB Refers. Compliance: Corrective action 1 of Requirement Document: Before further flight after 22 August 1986. Corrective action 2 of Requirement Document: At each daily inspection after 22 August 1986. Corrective action 3 of Requirement Document: This action may be carried out before further flight after 22 August 1986 in which case corrective actions 1 and 2 need not be complied with. Note: Corrective action in accordance with action 3 is an interim measure until manufacturer can supply improved drain valves. Background: Draining the fuel filters at preflight checks may loosen the handle of the shutoff plunger and under adverse conditions may cause the drain valve to disintegrate.