[Correction] Fuselage – Screws and Nuts installed on Firewalls – Inspection
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must inspect the firewall screws and nuts in the EECU compartment within 150 flight hours or 24 months after 16 June 2026, and in the MGB compartment within 800 flight hours or 24 months after the same date. If excessive sealant is found, it must be removed before the next flight following the instructions in the Airbus Helicopters Alert Service Bulletin EC175-53-00-0001. Compliance with these inspections and corrective actions is mandatory.
Summary
EASA Airworthiness Directive 2026-0110 is a corrective directive addressing Airbus Helicopters EC 175 B models manufactured before 19 November 2025. It mandates inspection of screws and nuts installed on the firewalls between the engine compartment and the electronic engine control units (EECU) and main gearbox (MGB) compartments for incorrectly applied high-temperature sealant. The directive aims to prevent potential ignition of the sealant that could lead to fires and engine power loss.
What changed
This directive republishes the original AD to correct the reference to the Airbus Helicopters Alert Service Bulletin EC175-53-00-0001. It introduces a one-time inspection requirement for the back sides of the two engine firewalls to identify and remove any improperly applied high-temperature sealant on screws and nuts. No previous AD is superseded by this correction.
Why it matters
This AD is critical for maintaining the safety and airworthiness of EC 175 B helicopters by preventing potential fire hazards caused by sealant ignition on firewall fasteners. Operators and maintenance teams must ensure compliance to avoid overheating and damage to key engine compartments, which could result in engine shutdown and loss of power. Timely inspections and corrective actions help preserve operational safety margins and prevent costly incidents.
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- EASA AD 2026-0039Time Limits / Maintenance Checks — Airworthiness Limitations Section — AmendmentFeb 27, 2026
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- EASA AD 2026-0022-E
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