EASA AD 2018-0139
SUPERSEDED BY EASA AD 2018-0257
Summary
EASA Airworthiness Directive 2018-0139 is an airworthiness directive addressing Rolls-Royce Trent 1000 series engines installed on Boeing 787 aircraft. It focuses on engines with specific serial numbers that have not incorporated Rolls-Royce Service Bulletin TRENT 1000 72-H818. The directive mandates actions to prevent engine in-flight shutdowns caused by intermediate pressure turbine blade (IPTB) sulphidation corrosion cracking.
What Changed
This directive supersedes EASA AD 2018-0086 and introduces updated applicability by adding and removing specific engine serial numbers and revising IPTB cyclic life limits. It requires operators to de-pair affected engines before exceeding these limits and restricts reinstallation unless modifications per Rolls-Royce SB TRENT 1000 72-H818 are applied. The directive reflects the latest analysis and service bulletin revisions to mitigate the risk of dual engine failures.
Why It Matters
For aviation professionals, this directive is critical to ensure continued airworthiness and flight safety by preventing potential engine failures due to corrosion cracking. Operators and maintenance organizations must monitor engine cyclic life limits closely and comply with de-pairing requirements to avoid in-flight shutdowns. Compliance ensures regulatory adherence and reduces operational risks associated with Trent 1000 engines on Boeing 787 aircraft.
What To Do
Operators must remove one of two affected engines installed on an aircraft before both exceed their respective IPTB cyclic limits or within 20 flight cycles after 2018-07-06, whichever is later. After removal, the affected engine cannot be reinstalled unless modified according to Rolls-Royce SB TRENT 1000 72-H818, which also serves as terminating action for the directive's requirements. Compliance with the latest Rolls-Royce Alert NMSB TRENT 1000 72-AJ992 Revision 3 is mandatory.
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