Engine — Intermediate Pressure Compressor Rotor Seal — Inspection / De-Pairing Limitation
- Published
- Effective
- Deadline
- Replaces
- 2018-0095
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must perform on-wing borescope inspections of affected seals within the compliance times specified in Rolls-Royce Alert NMSB TRENT 1000 72-AJ929 and repeat them at defined intervals. If cracking is detected beyond reject limits, the engine must be removed from service and repaired per Rolls-Royce instructions before further flight. Modification using Rolls-Royce SB TRENT 1000 72-K216 can be applied to terminate inspection requirements. These actions have been effective since 08 May 2018.
Summary
EASA Airworthiness Directive 2018-0095R1 is an updated safety directive addressing inspection and operational limitations for the intermediate pressure compressor (IPC) rotor buffer seal on Rolls-Royce Trent 1000 series engines, which power Boeing 787-8 and 787-9 aircraft. The directive mandates repetitive borescope inspections and sets operational restrictions to prevent engine power loss caused by seal cracking. It also introduces an optional modification that can terminate the inspection requirements.
What changed
This revision of EASA AD 2018-0095 introduces Rolls-Royce Service Bulletin TRENT 1000 72-K216 as an optional terminating action for the repetitive inspections of the affected IPC rotor buffer seals. It clarifies inspection intervals and de-pairing limitations for engines with affected seals and aligns requirements with related AD 2018-0094R1. The update also incorporates the latest service bulletin revisions and inspection procedures.
Why it matters
The directive is critical for operators and maintenance organizations to prevent potential engine failures due to cracking in the IPC rotor buffer seal, which could lead to engine power loss and reduced aircraft control. Compliance ensures continued airworthiness and operational safety of Boeing 787 aircraft equipped with Trent 1000 engines. It also provides a clear path for terminating repetitive inspections through approved modifications, optimizing maintenance planning and reducing operational disruptions.
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