Summary
We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 787-8 airplanes. This proposed AD was prompted by a report of wire chafing caused by a certain left wing spoiler actuator wire not having enough separation from a certain bracket when the spoiler is in the deployed position. This proposed AD would require measuring the separation between a certain electro- mechanical actuator wire of the left wing, spoiler 4, and the support bracket of the flap variable camber trim unit, and related investigative and corrective actions if necessary. We are proposing this AD to detect and correct wire chafing, which could result in an electrical short and potential fire in a flammable fluid leakage zone, and possible loss of several functions essential for safe flight.