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Dual Maintenance (ETOPS)

Dual maintenance means maintenance on the  same  ETOPS significant system. Dual maintenance is maintenance action performed on the same element of identical, but separate ETOPS Significant Systems during a scheduled or unscheduled maintenance visit.

 Dual maintenance on substantially similar  ETOPS significant systems means maintenance actions performed on engine-driven components on both engines during the same maintenance visit.

Source FAA AC 120-42B

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