COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Turbomeca Turbine Engines - Arriel Series AD/ARRIEL/4 Turbine Case Identification Plate Removal 8/86 Applicability: All Arriel Series I engines. Requirement: Action in accordance with Bureau Veritas Directive 86-29(B). Reference Document - Turbomeca S.B. Arriel No. 72-292-0093. Compliance: In accordance with Requirement Document. Background: This Directive has been issued to require compliance with Bureau Veritas Directive 86-29(B). The Directive requires removal of the turbine module identification plate to allow inspection of the turbine case for corrosion. This requirement has become necessary following blow-out of a turbine case in service with a reported loss of power.