Airworthiness Directive 2018-25-11
recurringAirworthiness Directives; The Boeing Company Airplanes
What this AD requires
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777-200 and -300 series airplanes equipped with Rolls-Royce Model RB211-Trent 800 engines. This AD was prompted by reports of inadequate clearance between the thermal protection system (TPS) insulation blankets and the electronic engine control (EEC) wiring, which resulted in damaged wires. This AD requires repetitive inspections of the EEC wire bundles and clips, and corrective actions if necessary. We are issuing this AD to address the unsafe condition on these products.
Which aircraft AD 2018-25-11 applies to
Applies only to 777-200/-300 airplanes equipped with Rolls-Royce Model RB211-Trent 800 engines on which Boeing Alert Service Bulletin 777-78A0094 actions have been incorporated, and where thermal protection system non-re-contoured insulation blankets P/N 315W5115-2, -6, or -20 are installed on the thrust reverser inner wall, or Rolls-Royce Service Bulletin RR.211-71-H824 (dated July 30, 2014) has not been incorporated on the engine, or both conditions are met.
Whether AD 2018-25-11 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.