EASA AD 2017-0253-E
SUPERSEDED BY EASA AD 2018-0086
Summary
EASA Airworthiness Directive 2017-0253-E is an emergency directive addressing safety concerns with Rolls-Royce Trent 1000 engines installed on Boeing 787 aircraft. It targets specific engine serial numbers susceptible to intermediate pressure turbine blade (IPTB) corrosion cracking that could lead to in-flight shut-downs. The directive mandates operational restrictions and maintenance actions to mitigate this risk.
What Changed
This directive introduces a requirement to de-pair certain affected Trent 1000 engines by removing one engine from service before exceeding cyclic life limits or within 20 flight cycles from the effective date. It also prohibits reinstalling removed engines without specific limitations and establishes that modification per Rolls-Royce Service Bulletin 72-H818 terminates these requirements. This AD is an interim measure pending further regulatory action.
Why It Matters
This directive is critical for aviation professionals as it addresses a safety risk that could cause dual engine in-flight shut-downs, impacting flight safety and operational reliability. Operators and maintenance organizations must ensure compliance to avoid unsafe engine configurations and potential regulatory penalties. It also affects engine pairing strategies and maintenance planning for Boeing 787 fleets equipped with Trent 1000 engines.
What To Do
Operators must remove one of two affected Trent 1000 engines installed on an aircraft before either engine exceeds its IPTB cyclic limit or within 20 flight cycles after 2017-12-22, whichever is later. Removed engines must not be reinstalled except under specified limitations. Modification of engines according to Rolls-Royce Service Bulletin 72-H818 will end these restrictions for that engine.
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