Time Limits / Maintenance Checks — Airworthiness Limitations Section — Amendment
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Boeing Model 777 airplanes must install required fuel system modifications, perform detailed inspections, and carry out corrective actions as specified. They must also revise their maintenance or inspection programs to incorporate the new airworthiness limitations. Compliance with this directive is mandatory by April 4, 2023.
Summary
The Federal Aviation Administration's Airworthiness Directive 2023-03-04 is a final rule addressing all Boeing Model 777 airplanes. It mandates modifications and inspections related to the fuel system, including installation of Teflon sleeves, cap sealing of fasteners, and revisions to maintenance programs to incorporate more restrictive airworthiness limitations. This directive aims to mitigate the risk of fuel tank explosions caused by arcing in the main and center fuel tanks.
What changed
This new airworthiness directive introduces requirements for specific fuel system modifications and detailed inspections depending on airplane configuration. It also requires operators to update their maintenance or inspection programs to include more restrictive airworthiness limitations. The directive addresses errors in previous service bulletins by specifying exceptions and clarifications without mandating the latest service bulletin revision.
Why it matters
This directive is critical for aviation professionals as it addresses a significant safety risk involving potential fuel tank explosions due to electrical arcing. Operators and maintenance organizations must ensure compliance to prevent catastrophic failures and maintain airworthiness. The updated maintenance requirements and inspections will impact maintenance planning and operational safety management.
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New ADs and bulletins for Boeing 777, summarized like this page, every Monday.