Oxygen – Low Pressure Oxygen Hoses – Replacement
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected MBB-BK117 D-2 and D-3 helicopters must replace each affected oxygen hose with a serviceable hose within 50 flight hours or 30 days from 22 June 2026, whichever occurs first. After replacement, no affected hoses or assemblies may be installed on the helicopter. Compliance must follow the instructions in Mecaer Aviation Group's Mandatory Service Bulletin SB-E4M-035 revision B.
Summary
EASA Airworthiness Directive 2026-0109 is issued for MBB-BK117 D-2 and D-3 helicopters modified with EASA Supplemental Type Certificate 10051018 up to revision 5. It addresses the replacement of low-pressure oxygen hoses installed in Emergency Medical Service interiors manufactured by Mecaer Aviation Group. The directive mandates replacing specific oxygen hoses and assemblies to prevent potential oxygen leakage.
What changed
This new Airworthiness Directive introduces a mandatory replacement of affected low-pressure oxygen hoses with serviceable ones due to detected age-related degradation and leakage risks. It also prohibits the installation or reinstallation of affected hoses or assemblies after the replacement. The directive references Mecaer Aviation Group's Mandatory Service Bulletin SB-E4M-035 revision B for compliance instructions.
Why it matters
This directive is critical for aviation professionals as it addresses a safety risk involving oxygen leakage that could increase the risk of fire in the cabin. Operators and maintenance organizations must ensure compliance to maintain airworthiness and avoid operating aircraft with unsafe oxygen distribution components. It also impacts parts procurement and maintenance planning due to the prohibition on installing affected hoses.
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