Wings - Centre Wing Box Rear Spar, Lower Skin, Lower Chord - Inspection / Repair
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Boeing 757-200, -200PF, -200CB, and -300 series airplanes must perform repetitive inspections of the center wing box rear spar, lower skin, and lower chord as specified in Boeing Alert Requirements Bulletin 757-57A0075 RB dated August 25, 2021. Any detected cracks must be repaired following the prescribed procedures. Compliance with this AD is mandatory by December 7, 2022, the effective date of the directive.
Summary
Airworthiness Directive AD 2022-20-15 is a final rule issued by the Federal Aviation Administration (FAA) addressing all Boeing Company Model 757 airplanes. It mandates repetitive inspections and repairs of cracks found in the fastener holes of the center wing box rear spar, lower skin, and lower chord. The directive aims to ensure the structural integrity of these aircraft by detecting and correcting potential cracking issues.
What changed
This new airworthiness directive introduces mandatory repetitive inspections using high-frequency eddy current and ultrasonic methods for specific areas of the center wing box rear spar and lower skin on Boeing 757 models. It also requires repairs if cracks are detected and clarifies sealant application requirements. Additionally, it confirms that installation of Supplemental Type Certificate STC ST01518SE does not affect compliance with this AD.
Why it matters
This directive is critical for aviation professionals as it addresses a structural safety concern that could compromise the ability of principal structural elements to sustain limit loads. Operators, maintenance, and repair organizations must comply to prevent potential structural failures, ensuring continued airworthiness and safety of Boeing 757 fleets. Clear guidance on inspection locations, sealant use, and repair procedures facilitates consistent compliance and maintenance planning.
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