Superseded. This AD was superseded by AD 2019-11-02. Verify which one applies to your serial and effectivity before any maintenance action.
AD 2017-16-10
Effective 09/25/2017 · Published 08/21/2017
Airworthiness Directives; The Boeing Company Airplanes
Summary
We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 777 airplanes. This AD was prompted by reports of cracks on the underwing longerons. This AD requires repetitive inspections of the left and right side underwing longerons for any crack, and related investigative and corrective actions if necessary. We are issuing this AD to address the unsafe condition on these products.