Airworthiness DirectiveEASA AD US-2019-25-14

Stringer Splices and Skin Splice Straps - Repetitive Inspections

Published: Jan 8, 2020
Effective: Feb 10, 2020
Deadline: Feb 10, 2020

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What to do

Operators of affected Boeing 777-300ER and 777F airplanes must begin repetitive detailed and high frequency eddy current inspections as specified in Boeing Alert Requirements Bulletin 777-53A0091 RB, dated April 8, 2019. Any detected cracks require immediate on-condition corrective actions. The directive is effective February 10, 2020, and operators should ensure all inspections and repairs comply with the specified service information by that date.

Summary

The Federal Aviation Administration's Airworthiness Directive 2019-25-14 mandates repetitive inspections for certain Boeing 777-300ER and 777F series airplanes. This directive addresses widespread fatigue damage in fuselage stringers, stringer splices, and skin splice straps by requiring detailed and high frequency eddy current inspections along with applicable corrective actions. The directive aims to ensure continued airworthiness and safety of these aircraft models.

What changed

This new airworthiness directive introduces mandatory repetitive detailed inspections of stringer splices and skin splice straps, as well as repetitive high frequency eddy current inspections of stringers and stringer splices. It also requires operators to perform on-condition repairs if cracks are found. The directive clarifies the use of Boeing Organizational Designation Authorization-approved repairs and excludes certain general information notes from mandatory compliance.

Why it matters

This directive is critical for operators, maintenance, repair, and overhaul organizations to prevent structural failures due to widespread fatigue damage in key fuselage components. Compliance ensures the structural integrity of Boeing 777-300ER and 777F airplanes, reducing the risk of in-service cracks that could compromise safety. It also provides clear guidance on inspection intervals and approved repair methods, facilitating regulatory compliance and operational safety.

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