Engine — De-Pairing Limitation
- Published
- Effective
- Replaces
- 2020-0010R2
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must ensure that within 30 days of 30 January 2020, engine pairings meet the acceptable installation requirements specified in Appendix 1 of the directive. From 11 March 2020, only engines meeting these requirements may be installed on affected aircraft. Engines modified with SB TRENT1000-72-K434 are exempt from these restrictions. Ongoing compliance with the updated de-pairing limits and maintenance instructions is mandatory.
Summary
EASA Airworthiness Directive 2020-0010R3 is an updated regulatory document addressing engine surge risks in Rolls-Royce Trent 1000 series engines installed on Boeing 787 aircraft. It applies to Trent 1000-A, -AE, -C, -CE, -D, -E, -G, and -H engines except those modified with Rolls-Royce Service Bulletin TRENT1000-72-K434. The directive mandates de-pairing limitations to mitigate the risk of dual engine surges that could lead to in-flight shutdowns.
What changed
This revision excludes Trent 1000 engines modified with Service Bulletin TRENT1000-72-K434 from the applicability, as these engines are no longer prone to the unsafe condition. It also incorporates updated de-pairing thresholds and instructions following the introduction of in-shop restoration actions via NMSB TRENT 1000 72-K494. The directive replaces previous versions and corrects errors in earlier service bulletin tables.
Why it matters
The directive is critical for operators and maintenance organizations to prevent dual engine surges that can compromise flight safety and aircraft control. Compliance ensures continued airworthiness and reduces the risk of unexpected engine shutdowns. It also clarifies acceptable engine pairings and maintenance actions, aiding in operational planning and regulatory adherence.
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