AD/TPE 331/17 - Turbine Bearing Oil Inlet Tube - Replacement - CANCELLED

This legislation scraps an old aviation safety rule about specific aircraft engines.

What it does

• Permanently cancels a previous requirement to replace or inspect turbine bearing oil inlet tubes on AlliedSignal (Garrett/AiResearch) TPE 331 series turbine engines (commonly used in small turboprop aircraft)
• Removes the need for mechanics to follow a specific manufacturer service bulletin (Airesearch SBNo. 79-0007) before installing these engines after they have been reconditioned (overhauled)

Who it affects

• Aircraft operators and maintenance organisations using planes powered by TPE 331 engines
• Anyone involved in engine overhauls for these specific models

Why it matters

• The original rule applied to engines reconditioned after September 1974; as of 24 September 2009, that restriction no longer exists
• Reduces paperwork and compliance costs for engine maintenance without replacing it with new requirements