Wings - Frame Tie Rod Assemblies & Stub Beam Upper Chords - Inspection
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Boeing 787-8 airplanes must perform the required repetitive inspections of the frame tie rod assemblies and stub beam upper chords as specified in Boeing Alert Requirements Bulletin B787-81205-SB570041-00 RB, Issue 001, dated March 7, 2019. Any detected cracking must be repaired before further flight using FAA-approved methods. Compliance with this directive is mandatory starting April 2, 2020.
Summary
The Federal Aviation Administration's Airworthiness Directive 2020-03-22 addresses certain Boeing Model 787-8 airplanes. It mandates repetitive inspections of the wing's left- and right-side frame tie rod assemblies and stub beam upper chords to detect fatigue cracking. The directive aims to maintain structural integrity and prevent possible airplane decompression.
What changed
This new airworthiness directive introduces mandatory repetitive inspections using high frequency eddy current and ultrasonic methods for specific wing components on Boeing 787-8 airplanes. It also requires applicable on-condition repairs if cracking is found. This AD is a new regulation prompted by reports of fatigue cracking and does not amend or supersede any previous directives.
Why it matters
This directive is critical for aviation professionals as it addresses a structural safety concern that could lead to failure of principal structural elements and potential decompression. Operators and maintenance teams must ensure compliance to prevent unsafe conditions and maintain airworthiness. The inspections and repairs help avoid costly in-service failures and enhance overall flight safety.
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