Wings - Lower Aft Wing Skin Bolt Holes - Repetitive Inspections / Repair
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected Boeing 757 models must perform repetitive high frequency eddy current inspections at specified flap track locations and carry out repairs if cracks are found. Compliance with this directive is mandatory starting December 29, 2021. Maintenance teams should refer to the specified Boeing and Aviation Partners Boeing service bulletins for detailed inspection and repair instructions.
Summary
Federal Aviation Administration Airworthiness Directive 2021-22-23 is a final rule addressing all Boeing 757-200, -200PF, -200CB, and -300 series airplanes. It requires repetitive high frequency eddy current inspections for cracks in the lower aft wing skin bolt holes at flap track attachment points, prompted by crack findings on a similar Boeing 737-300 design. The directive mandates repairs if cracks are detected to maintain structural integrity.
What changed
This new airworthiness directive introduces repetitive inspections using high frequency eddy current techniques for specific flap track locations on Boeing 757 airplanes. It clarifies inspection requirements for aircraft with Aviation Partners Boeing blended winglets installed or removed and corrects typographical errors from the proposed rule. The directive also incorporates related service bulletins from Boeing and Aviation Partners Boeing for inspection and repair procedures.
Why it matters
This directive is critical for aviation professionals to prevent undetected cracks that could compromise the wing structure's ability to carry limit loads. Operators and maintenance teams must ensure compliance to avoid potential structural failures and maintain airworthiness. The inspections help identify cracks early, reducing the risk of costly repairs or unsafe flight conditions.
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