Engine — Combustion Rear Inner Case Bolt — Replacement / Modification
- Published
- Effective
- Replaces
- 2025-0020
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must replace each affected CRIC bolt with a serviceable part during every qualified shop visit starting from 29 January 2025. Additionally, the engine must be modified using Rolls-Royce Service Bulletin RB211 72-K550 within 155 months of the effective date to terminate repetitive replacements. Compliance with these actions is mandatory to continue operating affected engines.
Summary
EASA Airworthiness Directive 2025-0020R1 is an updated directive addressing the replacement and modification of combustion rear inner case (CRIC) bolts, Part Number FW82729, on Rolls-Royce RB211 Trent 900 series engines. These engines are commonly installed on Airbus A380 aircraft. The directive mandates repetitive replacement of affected bolts during qualified shop visits and requires a modification of the engine to install an improved CRIC assembly to prevent bolt fractures.
What changed
EASA Airworthiness Directive 2025-0020R1 revises the original AD 2025-0020 by correcting the Time Limit Manual (TLM) reference in the definitions section. It maintains the requirement for repetitive bolt replacements and engine modification but clarifies compliance documentation references.
Why it matters
This directive is critical for aviation professionals as it addresses a safety risk caused by stress corrosion fractures in CRIC bolts, which could lead to uncontained engine failures. Operators and maintenance organizations must ensure compliance to maintain engine airworthiness and prevent potential damage to aircraft and risk to passengers and crew.
More for Rolls-Royce Deutschland Ltd & Co Kg RB211 TRENT 900
All 29- EASA AD 2016-0193R2Engine – Low Pressure Turbine Exhaust Case and Support Assembly (Tail Bearing Housing) – Inspection / ReplacementAug 13, 2026
- EASA AD 2026-0164Time Limits / Maintenance Checks – Engine Time Limits Manual – AmendmentAug 13, 2026
- EASA PAD 26-084Time Limits / Maintenance Checks – Engine Time Limits Manual – AmendmentJul 13, 2026
- EASA AD 2025-0190[Correction] Engine — Low Pressure Turbine Seal Panel — Modification / InspectionSep 4, 2025
Get the next one by email
New ADs and bulletins for Rolls-Royce Deutschland Ltd & Co Kg RB211 TRENT 900, summarized like this page, every Monday.