Wings - Strut to Wing Diagonal Brace & Nacelle Support Overwing Fitting - Inspection
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must perform the required inspections as specified in Boeing Alert Requirements Bulletin 737-57A1345 RB, including visual, ultrasonic, and magnetic checks, depending on the airplane model and configuration. Any detected cracks must be repaired following the on-condition actions outlined. Compliance with this AD is mandatory by August 27, 2020.
Summary
Federal Aviation Administration Airworthiness Directive 2020-14-03 is a final rule addressing all Boeing 737-300, -400, and -500 series airplanes. It mandates inspections of the strut to wing diagonal brace and the nacelle support overwing fitting to detect fatigue cracking. The directive includes visual, ultrasonic, and magnetic inspections depending on airplane configuration to ensure structural integrity.
What changed
This new airworthiness directive introduces mandatory inspections for cracking in specific wing and nacelle support structures on Boeing 737 Classic series airplanes. It requires general visual inspections, ultrasonic inspections at certain fastener locations, and magnetic checks to determine material composition. The AD also mandates on-condition corrective actions if cracks are found.
Why it matters
This AD is critical for maintaining the structural safety of Boeing 737 Classic airplanes by preventing undetected fatigue cracks that could compromise load-bearing capability. Operators, maintenance organizations, and compliance teams must address these inspections to avoid potential structural failures and ensure continued airworthiness. The directive helps mitigate risks associated with aging aircraft components.
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