EASA AD US-2018-13-06: Wings - Lower Outboard Wing Skin - Inspection

What to do

Operators must perform the initial HFEC inspection within the later of 1,500 flight cycles or 7,500 flight hours after winglet installation and continue with repetitive inspections as specified. If cracking is detected, repairs must be made following approved procedures. Stakeholders should also review and apply any previously approved repairs per the directive and use authorized alternative coatings where applicable. The directive became effective on August 22, 2018.

Summary

Airworthiness Directive 2018-13-06 is a final rule issued by the Federal Aviation Administration affecting certain Boeing 767-300 and 767-300F series airplanes. It addresses fatigue cracking in the lower outboard wing skin at the inboard segment of stringer L-9.5 on airplanes equipped with winglets installed per Supplemental Type Certificate ST01920SE. The directive mandates repetitive high frequency eddy current inspections and necessary repairs to ensure continued airworthiness.

What changed

This new airworthiness directive introduces mandatory repetitive HFEC inspections for cracking in the lower outboard wing skin at a specific stringer location and requires repairs if cracks are found. It also incorporates allowances for previously approved repairs, alternative coatings, and clarifies compliance times. The directive does not supersede any previous ADs but establishes new inspection and repair requirements.

Why it matters

This directive is critical for operators and maintenance organizations to prevent potential wing and winglet separation caused by fatigue cracking, which could severely reduce airplane controllability. Compliance ensures continued structural integrity and safety of affected Boeing 767-300/-300F airplanes with winglets. It also provides clarity on acceptable repair methods and materials, facilitating consistent maintenance practices.

What to do

Summary

What changed

Why it matters

More for Boeing 767