AD/ARRIEL/27 - HP Turbine (Module M03) - Turbine Blade Displacement - CANCELLED

This legislation cancels a previous aircraft safety rule (Airworthiness Directive AD/ARRIEL/27) that required checks on turbine blades in specific helicopter engines.

What it does:

• Removes the requirement for operators to inspect or repair High Pressure (HP) turbine blade displacement in Turbomeca Arriel series engines
• The cancellation took effect on 23 November 2009

Who it affects:

• Owners and operators of helicopters powered by Turbomeca Arriel turbine engines
• Maintenance organisations working on these engines

Why it matters: The old Australian safety rule is no longer needed because a European aviation safety directive (EASA AD 2007-0109R1) now automatically applies to these engines in Australia under the Civil Aviation Safety Regulations. This avoids duplicate rules and aligns Australian standards with international regulations.