Airworthiness Directive · Amendment 39-18441 · Nacelles/pylons
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 787-8 airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin B787-81205-SB540004-00, Issue 002, dated December 3, 2015.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 787-8 airplanes. This AD was prompted by a report of fuel leaking onto the hot exhaust portion of an engine as a result of an unintended leak path from the leading edge through the pylon. This AD requires installing new seal dams in the inboard and outboard corners of the aft pylon frame on the left and right engines, including an inspection for damage of the outboard blade seal and applicable corrective actions. We are issuing this AD to prevent fuel leaking from an unintended drain path from the leading edge through either the left or right pylon and onto the hot engine parts or brakes, which could lead to a major ground fire.
Within 60 months after the effective date of this AD, install new seal dams in the inboard and outboard corners of the aft pylon frame on the left and right engines, including a general visual inspection to detect damage of the outboard blade seal, and do all applicable corrective actions, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin B787-81205-SB540004-00, Issue 002, dated December 3, 2015. Do all applicable corrective actions before further flight, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin B787-81205-SB540004-00, Issue 002, dated December 3, 2015.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
