Place this clip at the start of a travel or simulator edit, right before a boarding chime and a camera shutter moment, then follow it with a runway or takeoff sound to move the scene from gate to departure.
关于此声音
This clip is the rhythmic barking and whining noise of an Airbus power transfer unit, lasting just under eight seconds as the hydraulic system balances pressure. It feels oddly mechanical and familiar, a little tense at first and then satisfying for plane fans who recognise that distinctive cabin sound instantly from startup and taxi.