COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters AD/BELL 206/109 Amdt 3 Tail Boom Skin 10/96 Applicability: Models 206L, 206L-I and 206L-III with tail booms P/Nos 206-033-004-3, -11,-103, and -45 installed. Requirement: Inspect in accordance with the requirements of Bell Alert SB 206L-87-47 Rev C. Where the SB specifies inspection with a 5X glass, a 10X glass is to be used. Note: FAA AD 96-14-10 refers in part. Compliance: For unmodified tailbooms - within 50 hours time in service from the last compliance with the previous issue of this Directive, thereafter at intervals not exceeding 50 hours time in service until modified. For modified tailbooms - within 100 hours time in service from the last compliance with the previous issue of this Directive, thereafter at intervals not exceeding 100 hours time in service. Replacement of the tailboom with P/N 206-033-044-143 or -173 terminates the requirements of this Directive. This Amendment is effective from 12 September 1996. Background: Severe upper skin cracks in the applicable tailbooms have been found in service. Amendment 2 introduced relaxed inspection intervals for the modified booms. Amendment 3 introduces a revised inspection requirement, provides terminating action, and references a similar FAA AD. The original issue of this Airworthiness Directive became effective on 11 September 1987. Amendment 1 of this Airworthiness Directive became effective on 26 January 1989. Amendment 2 of this Airworthiness Directive became effective on 10 August 1989.