AD 2026-16-06: The Boeing Company Airplanes

What the FAA requires

The FAA is superseding Airworthiness Directive (AD) 2018-11- 14, which applied to certain The Boeing Company Model 767-300 and -300F series airplanes with certain winglets installed. AD 2018-11-14 required high frequency eddy current (HFEC) inspections for cracking of the lower outboard wing skin and repair or modification if necessary. AD 2018-11-14 also required one of three follow-on actions: Repeating the HFEC inspections; modifying certain internal stringers and oversizing and plugging the existing fastener holes of the lower wing; or modifying the external doubler/tripler and doing repetitive post- modification inspections. This AD was prompted by reports of fatigue cracking in the lower outboard wing skin at the inboard fastener of stringer L-9.5, and the lower outboard wing skin of stringer L-6.5, on airplanes with winglets installed per Supplemental Type Certificate (STC) ST01920SE. This AD was also prompted by a determination that, for certain airplanes, the area of the lower wing skin in the vicinity of the critical inboard end fasteners of installed repair doublers must be inspected. This AD continues to require the actions in AD 2018-11-14, adds to the applicability airplanes that have had STC ST01920SE installed and the STC winglets removed, and, for certain airplanes, requires repetitive internal and external HFEC inspections of the lower outboard wing skin common to the external doubler repair at stringer L- 9.5 and repair if necessary. The FAA is issuing this AD to address the unsafe condition on these products.

Read the full directive on the Federal Register →

Applicability

Boeing requested that the FAA revise paragraph (c) of the proposed AD by adding that the AD is not applicable to Model 767-300 and -300F series airplanes on which STC ST01920SE has never been installed. Boeing noted that paragraph (c) of the proposed AD refers to paragraph 1.A.1 of Aviation Partners Boeing Service Bulletin AP767-57-010, Revision 14, dated November 17, 2025; and AP767-57-014, Revision 3, dated November 17, 2025; for the airplane applicability, but the service information lists airplane groups based on which APB kits have been installed instead of identifying individual airplanes. Boeing also stated that the referenced service information is unavailable to operators who have n

Part numbers this directive names

This directive does not name specific part numbers in its text; it applies by aircraft model. See the applicability above and the manufacturer's service bulletin it references.