EASA AD 2021-0135
Oxygen — Low-Pressure Oxygen Flexible Hoses — Replacement
Summary
EASA Airworthiness Directive 2021-0135 is an airworthiness directive addressing the replacement of low-pressure oxygen flexible hoses installed on certain Boeing 737-700, 737-800, 747-400, 747-8, 767-400ER, and 777-200 aircraft modified by Lufthansa Technik AG Supplemental Type Certificates. The directive targets conductive oxygen flex-hoses in gaseous passenger oxygen systems that pose a fire risk. It mandates replacing these with non-conductive hoses to ensure continued airworthiness and safety.
What Changed
This new directive introduces a mandatory replacement of conductive low-pressure oxygen flexible hoses with non-conductive ones on specified Boeing aircraft modified by Lufthansa Technik AG STCs. It prohibits the reinstallation of affected conductive hoses after replacement. The directive aligns with prior FAA ADs but extends the requirement to additional aircraft models modified by Lufthansa Technik AG.
Why It Matters
This directive is critical for aviation professionals because conductive oxygen hoses can allow electrical current to pass, potentially causing melting or burning and leading to oxygen-fed fires in passenger cabins. Operators and maintenance organizations must ensure compliance to prevent safety hazards and maintain regulatory approval for aircraft operation. It also affects parts procurement and maintenance planning due to the prohibition on reinstalling affected hoses.
What To Do
Operators of affected Boeing 737-700, 737-800, 747-400, 747-8, 767-400ER, and 777-200 aircraft modified by Lufthansa Technik AG STCs must replace all conductive low-pressure oxygen flexible hoses with approved non-conductive hoses within 48 months of 16 June 2021. After replacement, installation of affected conductive hoses is prohibited. Compliance must follow the instructions in the applicable Lufthansa Technik Design Change Summaries referenced in the directive.
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