EASA AD 2025-0020R1
Engine — Combustion Rear Inner Case Bolt — Replacement / Modification
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.
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.