EASA AD US-2019-25-12
Oxygen - Low-Pressure Oxygen Flex Hoses - Replacement
Summary
The Federal Aviation Administration's Airworthiness Directive 2019-25-12 addresses certain Boeing 777-200 and 777-300ER series airplanes equipped with therapeutic oxygen systems. This directive mandates the replacement of low-pressure oxygen flex hoses with new non-conductive hoses to prevent potential electrical conductivity hazards. The directive updates and supersedes the previous AD 2016-18-02 by adding additional required actions for certain airplane groups.
What Changed
This AD supersedes AD 2016-18-02 by retaining the original replacement requirements and adding new actions for Group 4 airplanes that were previously omitted in the service information. It incorporates Boeing Special Attention Service Bulletin 777-35-0041, Revision 1, dated August 14, 2019, which includes updated procedures and additional instructions for affected airplanes.
Why It Matters
This directive is critical for aviation professionals because it addresses a safety risk where conductive low-pressure oxygen flex hoses could allow electrical current to cause melting or burning, potentially leading to an oxygen-fed fire in the passenger cabin. Compliance ensures the continued airworthiness and safety of Boeing 777 aircraft equipped with therapeutic oxygen systems, protecting passengers and crew from fire hazards.
What To Do
Operators of affected Boeing 777-200 and 777-300ER airplanes must replace the low-pressure oxygen flex hoses with non-conductive hoses as specified in Boeing Special Attention Service Bulletin 777-35-0041, Revision 1. The AD is effective January 21, 2020, and compliance with the required actions must be completed accordingly. Stakeholders should review the service bulletin for detailed procedures and ensure all required actions, including those newly added for Group 4 airplanes, are accomplished.
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