Engine — Intermediate Pressure Compressor Rotor Seal — Inspection / De-Pairing Limitations
- Published
- Effective
- Deadline
- Replaces
- 2018-0094
- Replaces
- 2017-0017R2
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must perform repetitive on-wing borescope inspections of the affected seals within specified compliance times and intervals as detailed in Rolls-Royce Alert NMSB TRENT 1000 72-AJ467. If cracks beyond reject limits are found, seals must be replaced before the next flight or engine release to service. Modification of engines using Rolls-Royce Service Bulletins 72-J603, 72-J704, or 72-K216 can terminate repetitive inspections. Compliance with inspection and maintenance requirements must be ensured from the effective dates stated.
Summary
EASA Airworthiness Directive 2018-0094R1 is a regulatory update addressing inspection and de-pairing limitations for the intermediate pressure compressor rotor seal on Rolls-Royce Trent 1000 engines installed on Boeing 787-8 and 787-9 aircraft. The directive mandates repetitive borescope inspections and corrective actions for affected seals to prevent engine power loss. It also introduces optional terminating actions through specific Rolls-Royce service bulletins.
What changed
This revision of EASA AD 2018-0094 introduces Rolls-Royce Service Bulletin TRENT 1000 72-K216 as an additional optional terminating action for repetitive inspections on Group 1 engines. It also clarifies the definitions of the affected seal and Group 2 engines, updating de-pairing requirements accordingly. The AD supersedes previous versions and incorporates new inspection and maintenance instructions.
Why it matters
This directive is critical for aviation professionals to ensure the continued airworthiness of Trent 1000 engines by preventing potential engine power loss caused by cracked intermediate pressure compressor rotor seals. Operators and maintenance organizations must comply to avoid in-flight engine shutdowns and maintain safe aircraft operation. It impacts inspection schedules, maintenance planning, and part replacement strategies.
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