EASA AD 2026-0110
Fuselage – Screws and Nuts installed on Firewalls – Inspection
Summary
EASA Airworthiness Directive 2026-0110 is an airworthiness directive issued for Airbus Helicopters EC 175 B helicopters 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 fire hazards caused by improper sealant application on these components.
What Changed
This new airworthiness directive introduces a one-time inspection requirement to identify and remove any excessive high-temperature sealant applied as a top-coating on screws and nuts on the back sides of the engine firewalls. It specifies inspection intervals of 150 flight hours or 24 months for the EECU compartment firewall and 800 flight hours or 24 months for the MGB compartment firewall. Corrective actions must be taken before the next flight if non-compliant sealant is found.
Why It Matters
This directive is critical for aviation professionals because improper sealant application can ignite under high temperatures, potentially causing fires in critical compartments and leading to engine shutdown or loss of power. Operators and maintenance organizations must comply to ensure continued airworthiness and safety of EC 175 B helicopters. Failure to comply could result in significant safety risks and regulatory non-compliance.
What To Do
Operators of EC 175 B helicopters must perform inspections of 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 any excessive sealant is found, it must be removed before the next flight following the instructions in Airbus Helicopters Alert Service Bulletin EC175-53-00-000. Compliance with these actions is mandatory to maintain airworthiness.
Your fleet's weekly compliance brief
AI-summarized regulatory changes, compliance deadlines, and action items — filtered to your aircraft, every Monday.
AI-generated summary from official EASA source document. Always verify against the original.