WITHDRAWN - EXPLANATORY STATEMENT ATTACHED

Proposal for consultation. Not binding until EASA issues the final AD; the requirements can still change.

Published: Sep 5, 2025

Safran ARRIUS 2

AI-generated summary of the official EASA document. Verify against the PDF before acting.

What to do

Affected operators and maintenance providers should await further guidance from EASA regarding the correct software version and any future directives. No compliance actions are currently required under Proposed AD 25-138, and stakeholders should monitor official communications for updates.

Summary

EASA Withdrawal Statement for Proposed AD 25-138 announces the withdrawal of the proposed airworthiness directive concerning engine modifications for AHD EC135 T3 and EC635 T3 helicopters in pre-TU 172 configuration. The withdrawal follows findings of incompatibility between the TU 172 software and EC135 T3 avionics. Further investigations are required to determine the correct software version.

What changed

The Proposed AD 25-138, which would have mandated modifications to engines eligible for installation on AHD EC135 T3 and EC635 T3 helicopters, has been withdrawn. This means no immediate regulatory action will be taken regarding the engine modifications until further investigations are completed.

Why it matters

This withdrawal is important for operators and maintenance organizations as it prevents premature compliance with potentially incompatible software modifications. It ensures that any mandated changes will be based on confirmed technical compatibility, avoiding unnecessary maintenance or operational disruptions.

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