Wire strike protection system

A Bell 206 shows cutters above and below cockpit section of WSPS.

The wire strike protection system (WSPS) (Developed for the OH-58 / Bell 206 in 1979) is an system of components designed to mitigate the risk of wire strikes while flying helicopters at nap-of-the-earth altitudes, as well as takeoffs and landings.

The system is mounted around the front of many U.S Marine Corps, U.S Navy, U.S Air Force, U.S Army,[1] and some civilian helicopters. The larger CH-46 and CH-47 tandem rotor helicopters have no WSPS systems installed.

The WSPS system appears as two guidance swords at the upper and lower front of the cabin protruding forward at 45° above and below the horizontal. In each of the inner corners to the cabin a large fixed, pair of scissors made of hardened steel is mounted whose opening angle is so small that a speedy or forced incoming steel cable is cut through.

(These swords are often mistaken for radio antennas). The entire system may include upper and lower cutter assemblies, a non-electrically conductive abrasive strip wire scoring device along the center of the divided windscreen and windshield wiper protector frames to keep wires from hanging up on wiper motor shafts.[2] The WSPS is designed to channel a wire or cable into the cable cutter to score and weaken it as it travels into the cutter assembly and "cut" a wire before it can entangle the rotor system. The U.S. Army Safety Center at Fort Rucker, AL, claims that in a single wire strike 90% survivability is achieved by using WSPS. The more wires encountered at a given time the less likely WSPS will help the aircraft survive the encounter.

Some WSPS lower cutters have a break away tip in case of nose low ground impact.

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See also

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