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Aircraft Wiring Supplies

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If the balance is not paid in full within 6 months, interest will be charged to your account from the date of purchase. A minimum monthly payment is required. subject to credit approval. View Terms - For PayPal Credit, opens in a new window or is almost obsolete. The avionics are having intermittent noise or performance issues and someone says "Probably bad grounding." The truth is that in the mysterious world of avionics problems, electrical landing problems are one of the most common headaches, and some aircraft are prone to problems due to the nature of their structures. Yes, fabrics and synthetics are a challenge. However, many avionics grounding problems are created by installers, even though many installation manuals are very clear on the correct way to terminate and connect ground connections within the harness.

Grounding is not limited to cable bundles. There are specific requirements for antenna grounding and distance separation, and the space available on small aircraft is limited, so compromises are made. Sometimes the wiring needs to be readjusted.

This beginner's technical guide focuses on the very simple basics of a typical electrically grounded avionics system. Let's look at some best installation practices and pitfalls, along with some of the more common symptoms that poor grounding can cause. In our research, we spoke with professional avionics installers and avionics manufacturers who build kits, diagram them, and work technical support lines.

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How can we get a rationale? There are 10-32 screws securing numerous ring terminals (opposite page), commercial items such as "forest of tabs" grounding systems and marine equivalents (left), and independent methods such as a do-it-yourself brass rod system (right). ). ) ) designed to connect high and low current ground wires together.

Please pardon the oversimplification. Let's get to the point. The avionics grounding concept (two-wire concept of power lead [positive] and negative lead) is not very different from grounding other electrical devices. In the world of building aircraft avionics, maintaining good grounding is a means of reducing electrical noise from stray currents that can easily permeate even the best audio control panels. Electrical noise (voltage differential) and electromagnetic interference (EMI) can also disable critical systems including the autopilot, EFIS and engine monitor.

Of course, a ground wire is also important to prevent short circuits or costly air smoke shows. And to complete the chain are fuses and switches. This is an important safeguard in systems using a 2-wire connection. Circuit breakers and fuses open circuits, stopping the flow of voltage when there is a short circuit. But a good landing is so important that we build a whole system for the job called a ground bus. or bus bar.

By building a ground bus, you basically take the gas off the ground operations and eliminate problems with loose connections, vibration, corrosion, and lack of contact between the ground wire (or ground handle) and the structure. It is essential in composite and textile machines.

Aircraft Systems: Types Of Electricity

When talking about ground buses, do not confuse them with convertible electric buses (such as avionics and main buses). You cannot turn the ground bus on or off. Don't overthink it. A dedicated ground bus is simply a piece of copper that you use as the primary return point for all negative leads on a 2-wire circuit. Dedicated ground buses became the standard, rather than individual main grounds distributed around the aircraft.

When it comes to a proper avionics system, you need a solid understanding of how avionics manufacturers construct, route, and terminate ground wires. Fortunately, most of the installation instructions for the equipment you plug into the kit have been improved to avoid misunderstandings, wiring errors, and tailgating. However, we need to clear up some basic theories, terminology and nomenclature found in wiring printing. Shields, shield drains, electrical highs and lows - there's a lot of jargon. Avionics manuals are also written with the understanding that you have at least a knowledge of DC (and sometimes AC) electrical theory. If you have any doubts, work with an avionics shop to assist with wiring (or have them build a more complex and critical harness) and start thinking about avionics early in the build process. This is what we mean.

Generator whines and noises often permeate even the best audio systems. Before spending time and money on a noise filter (left), make sure your landing is done exactly as specified in your audio system installation manual. Taking a good look at the alternator wiring (right) isn't a problem either. Rectifiers fail, but the biggest source of noise is usually elsewhere.

Grounding within network wires is very important for clean data transmission. Both Garmin (above) and Dynon (above) require grounding between individual devices. Garmin also requires that the CAN bus wires be shielded and terminated at each segment of the chain.

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The manufacturers and technicians we spoke with emphasized the importance of planning the grounding system (think of the entire ground and the main system in series) before starting wiring and before assembling and closing the main structure. For typical avionics configurations we work with, plan to bring all major ground wires to a convenient, central location on the airframe. With a dedicated ground bus, all grounds terminate in the same area and the bus must be labeled to match the aircraft's wiring diagram. This will make troubleshooting easier down the road (yours or someone else's) while removing any chasing when trying to figure out which soil is causing grief. A centralized ground bus makes it easier to ohm-out wiring during pin-to-pin troubleshooting.

A common place to build a ground bus is on top of a firewall. Think of it as a hub, the meeting point for system ground wires running through the fuselage, except for systems in the engine bay that need to be grounded. It's worth mentioning that you don't want to use motor mounts to pass current (no, not even a fuel tank, we've seen horror). Of course, the motor mount itself must be grounded and the motor must be connected to the firewall with a suitable grounding strap.

We've covered this before and it's always worth revisiting. It is never too early to plan an antenna installation, and proper grounding can make or break performance. Do you have an aluminum airplane? Your job can be easy. Composites or Textiles? It may not be very much. More on antenna grounding in a moment. The planning phase is when you want it.

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