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How Far Should Flight Control Wiring Be Separated?

400x400_flightControlSeparated_2018_Q3Many considerations go into determining how to route wiring inside of an aircraft.  Each system’s wiring must be routed separately to maintain control of the vehicle under normal and emergency conditions.  Flight control wiring should be kept separate from all firing and control circuits associated with ordnance and explosive subsystems. Control wiring passing through high-temperature areas must be properly shielded and insulated to prevent damage.  

Flight control wiring should be separated from other wiring harness bundles (and properly clamped) a minimum of 0.5 inches. This separation is maintained throughout the entire range of motion in areas containing moving parts to prevent possible damage or loss of control systems.  

Flight control wires should be kept separate from wires and cables carrying heavy current loads and their associated aircraft Electrical Wiring Interconnect System (EWIS) components.  Physical separation and electrical isolation are necessary to prevent damage or interference under normal and fault conditions.

Reference “Wiring, Aerospace Vehicle” document number AS50881 for more details. This specification covers all aspects of wiring aerospace vehicles, from the selection to the installation of wiring and wiring devices. Aerospace vehicles include airplanes, helicopters, lighter-than-air vehicles, and missiles. To learn more about AS50881, read this article.

When designing your aircraft’s EWIS, don’t forget to separate your flight control wiring. To learn more about flight control systems in aircraft, refer to, “Four Methods To Separate Flight Control Wiring Harnesses In An Aircraft” or call InterConnect Wiring at +1.817.377.WIRE [9473].

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We are the sole licensee of Lockheed Martin for F-16 electrical products. Through this agreement, we have access to Lockheed Martin’s F-16 engineering data, tooling and configuration control information. We also have a Technical Services agreement with Sikorsky for all of their aircraft. This agreement allows us to obtain their engineering data needed to rewire helicopters that Sikorsky manufactures.

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