EASA AD 2018-0115-CN
CANCELLED: Engine — Accessory Gearbox Mount Assembly Tie Bolts — Replacement
Summary
EASA Airworthiness Directive 2018-0115-CN is a cancellation notice for the previously issued AD 2018-0115 concerning Rolls-Royce Deutschland BR700-710C4-11 engines installed on aircraft such as the Gulfstream GV-SP (G550). The directive addresses the replacement of accessory gearbox mount assembly tie bolts with part number 39544000. This cancellation confirms that the previously identified unsafe condition related to tie bolt fatigue life does not exist.
What Changed
EASA Airworthiness Directive 2018-0115-CN cancels the earlier AD 2018-0115 which mandated replacement of the accessory gearbox mount assembly tie bolts on certain BR700-710C4-11 engines. The cancellation follows a re-assessment showing that the affected tie bolts have sufficient fatigue life to withstand post-fan blade-off windmilling loads, eliminating the need for the replacement.
Why It Matters
This cancellation is important for aviation professionals as it removes the requirement for tie bolt replacement, reducing unnecessary maintenance and associated downtime for operators and maintenance organizations. It clarifies that the risk of accessory gearbox separation due to tie bolt failure is not present, ensuring compliance efforts can be adjusted accordingly.
What To Do
Operators and maintenance teams should note that no action is required regarding the replacement of accessory gearbox mount assembly tie bolts for the affected BR700-710C4-11 engines. Compliance with the cancelled AD 2018-0115 is no longer necessary, and no new compliance deadlines apply.
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