An anti-impact shield for a mechanical part of a rotorcraft, the mechanical part having a central portion together with first and second U-shaped ends each having a bottom wall and two side branches, the bottom walls of the ends of the mechanical part being parallel to each other and secured to the central portion. The device comprises a trigger wire, two switches, an alerting means associated with the switches and a battery. The needle firing assembly includes two translating members, a resilient member, and a motor. The lid is supplemented by small containers at spaced positions therearound and a post each for receiving and displaying related articles. The first electrode is connected to the first region of the semiconductor layer divided by the first DTI. The method further includes pulsing an electron beam and irradiating the interconnect with the electron beam, and detecting a current generated when the interconnect is irradiated with the electron beam, by the current detector, while adjusting an opening and a closing of a gate in the gating device.