Airworthiness directives › 2018-25-11
AD 2018-25-11 Airworthiness Directives; The Boeing Company Airplanes
Models named: 777-200, -300 series, RB211-Trent 800. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model 777-200 and -300 series airplanes, certificated in any category, equipped with Rolls-Royce Model RB211-Trent 800 engines, on which the actions specified in Boeing Alert Service Bulletin 777-78A0094 have been incorporated, and the condition specified in paragraph (c)(1) or (c)(2) of this AD is met on any engine, or both conditions specified in (c)(1) and (c)(2) of this AD are met on any engine. (1) Thermal protection system (TPS) non-re-contoured insulation blankets having part numbers (P/N) 315W5115-2, -6, or -20 are installed on the thrust reverser (T/R) inner wall. (2) Rolls-Royce Service Bulletin RR.211-71-H824, dated July 30, 2014, has not been incorporated on the engine.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 2,000 flight hours since the most recent EEC wire bundle inspection done as specified in Boeing Special Attention Service Bulletin 777-78-0071; or Boeing Service Bulletin 777-78-0082; or within 500 flight hours after the effective date of this AD, whichever occurs later: Do a detailed inspection for damage of the EEC wire bundles and clips, and do all applicable corrective actions, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777-78-0082, Revision 1, dated June 15, 2015. Do all applicable corrective actions before further flight. Repeat the inspection thereafter at intervals not to exceed 2,000 flight hours.
Unsafe condition
This AD was prompted by reports of inadequate clearance between the TPS insulation blankets and the electronic engine control (EEC) wiring, which resulted in damaged wires. We are issuing this AD to address damaged wires, which could result in in-flight shutdown of the engine, or the inability to properly control thrust, and consequent reduced controllability of the airplane.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1