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26.50 Seats, berths, safety belts, and harnesses - Regulation (EU) 2015/640
Operators of large aeroplanes used in commercial air transport, type certified on or after 1 January 1958, shall ensure that each flight or cabin crew member seat and its restraint system are configured in order to provide an optimum level of protection in an emergency landing whilst allowing the occupant’s necessary functions and facilitating rapid egress.