Engine – Oil Service Pipe Sealing Rings – Replacement
Superseded. Comply with 2019-0230, which replaces this document.
- Published
- Effective
- Deadline
- Replaces
- 2016-0061
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators and maintenance organizations must replace affected sealing rings within 600 to 800 flight cycles depending on engine group classification or within 100 flight cycles after the effective date, whichever is later. They must also avoid installing affected parts on modified engines and may perform the specified Rolls-Royce service bulletin modification as a terminating action to the life limit requirement.
Summary
EASA Airworthiness Directive 2018-0199 is an airworthiness directive addressing Rolls-Royce RB211 Trent 970-84, 972-84, and 972E-84 engines, commonly installed on Airbus A380 aircraft. The directive focuses on the replacement and life limitation of high pressure/intermediate pressure support structure oil service tube buffer sealing rings with Part Number FW64487 to prevent potential engine failures.
What changed
This directive supersedes EASA AD 2016-0061 and introduces a life limit for the affected sealing rings, requiring their replacement within specified flight cycle limits. It also prohibits installation of these parts on engines that have embodied modification 72-J395 and allows modification as a terminating action for the life limitation.
Why it matters
This directive is critical for aviation professionals as it addresses a safety risk involving wear on sealing rings that could lead to engine shaft failure and turbine disc burst, posing a hazard to aircraft integrity and safety. Compliance ensures continued airworthiness and prevents costly in-service failures and potential accidents.
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