The Boeing 787 Dreamliner is a modern wide-body airliner known for its quieter cabin and composite airframe, and its hydraulic systems power flight controls, landing gear and brakes. Real recordings of those systems have become popular among plane spotters and flight simulator creators, who value authentic sounds over generic effects. Shared through soundboards and aviation forums, this short clip is reused because it is instantly recognisable to enthusiasts and adds credibility to videos about commercial flying, aircraft maintenance and airport operations.