EASA AD US-2022-18-11
SUPERSEDED BY FAA AD 2023-17-14
Summary
FAA Airworthiness Directive 2022-18-11 is a final rule affecting all Boeing Company Model 777 airplanes, including the 777-200, -200LR, -300, -300ER, and 777F variants. It addresses the discovery of cracks in the front spar lower chord during underwing longeron replacements and mandates repetitive inspections and modifications to critical structural components at station 1035. The directive aims to prevent fuel leaks, fire hazards, and potential structural failures.
What Changed
This new airworthiness directive introduces repetitive inspections for cracking in the left and right side ring chords, repair angles, front spar lower chords, and front spar webs related to the underwing longeron. It requires modifications to the front spar lower chord on some airplanes, followed by repetitive post-modification inspections and applicable on-condition corrective actions. The AD also clarifies the relationship with previous AD 2019-11-02 and specifies updated inspection tables and approval processes.
Why It Matters
This directive is critical for aviation professionals to ensure the structural integrity and safety of Boeing 777 aircraft by detecting and repairing cracks that could lead to fuel leaks or fires. Operators, maintenance, and compliance teams must incorporate these inspections and modifications into their maintenance programs to meet regulatory requirements and avoid operational disruptions. Understanding the interplay with previous directives helps maintain compliance and safety standards.
What To Do
Affected operators must perform the required repetitive inspections and modifications as specified in Boeing Alert Requirements Bulletin 777-57A0122 RB dated October 8, 2021. Compliance with the AD is mandatory by October 31, 2022, the effective date. Operators should also review and apply any on-condition actions and ensure coordination with FAA-approved alternative methods of compliance if proposing alternative repairs.
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