EASA AD 2021-0105: Power Plant — Front Engine Firewall Angles — Replacement | RegNotify

Airworthiness DirectiveEASA AD 2021-0105

Power Plant — Front Engine Firewall Angles — Replacement

Published: Apr 15, 2021
Effective: Apr 29, 2021
Deadline: Apr 29, 2023

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

What to do

Operators of affected EC 175 B helicopters must replace the specified aluminium firewall parts with serviceable titanium parts within 1,800 flight hours or 24 months from 29 April 2021, whichever occurs first. The replacement must follow the instructions in Section 3 of Airbus Helicopters Alert Service Bulletin EC175-71A017.

Summary

EASA Airworthiness Directive 2021-0105 is an official regulatory document addressing Airbus Helicopters EC 175 B models. It mandates the replacement of certain aluminium front engine firewall angles with titanium parts to meet fire resistance requirements and ensure continued airworthiness.

What changed

This new Airworthiness Directive introduces a requirement to replace affected aluminium joint elements of the engine bay firewall with titanium firewall angles as specified in Airbus Helicopters Alert Service Bulletin EC175-71A017. It applies to all EC 175 B helicopters except those already incorporating modification 99A06105 in production.

Why it matters

This directive is critical for aviation professionals because the aluminium firewall components do not meet fire resistance standards, posing a risk of uncontained engine bay fire and potential loss of helicopter control. Operators, maintenance, and compliance teams must ensure timely replacement to maintain safety and regulatory compliance.

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