Engine — Low Pressure Compressor Shafts — Life Reduction
- Published
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- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected operators and maintenance organizations must remove from service the specified low pressure compressor shafts before they exceed 10,500 flight cycles or within 30 days after 7 August 2018, whichever is later. Installation of affected shafts is only permitted if the shaft has not exceeded 10,500 flight cycles since first installation. Compliance should follow the instructions provided in Rolls-Royce Alert Non-Modification Service Bulletin RB.211-72-AJ985.
Summary
EASA Airworthiness Directive 2018-0157 is an airworthiness directive addressing Rolls-Royce RB211-524G and -524H engines installed on Boeing 747 and Boeing 767 aircraft. It focuses on the low pressure compressor shafts, specifically part number UL24833, which have undergone unauthorized repairs affecting their approved life. The directive mandates life reduction and removal from service of affected shafts to prevent potential shaft fracture and consequent damage to the aircraft.
What changed
This new airworthiness directive introduces a life reduction requirement for low pressure compressor shafts that have been subject to unauthorized repairs. It requires removal from service of specific shafts identified by serial numbers before exceeding 10,500 flight cycles or within 30 days of the effective date. Additionally, it allows installation of affected shafts only if they have not exceeded 10,500 flight cycles since first installation.
Why it matters
This directive is critical for aviation professionals as it addresses a safety risk related to potential shaft fractures that could lead to high energy debris release and reduced aircraft control. Operators and maintenance organizations must ensure compliance to maintain continuing airworthiness and avoid unsafe conditions. Compliance teams need to track affected parts and adhere to the mandated life limits to prevent operational disruptions and regulatory penalties.
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