Abstract: This device (100), making it possible to pass a cable through a passage in a supporting structure delimited by a closed contour, comprises:a frame (110) suspended under the helicopter and having means (112-117) for centering and supporting the device on the supporting structure,supported by this frame, two aligned straight guides (124, 124') located at a distance from one another on either side of the supporting structure and oriented in such a way that their common axis passes through the passage of this supporting structure,a slide (130) movable in translational motion through the straight guides, of a length greater than the gap between these and equipped with means (132) for fastening the end of the cable to it,drive means (125, 125') for moving the slide completely from one guide (124) to the other (124') and retrieving it in this other guide, at the same time carrying the wire across the gap between the guides so as to cause it to pass through the passage.