![]() Not only must the ignition be independent of the battery/generator system, but your plane also must have two ignition systems that are independent of each other. This is accomplished on most airplane engines by the use of magnetos to create the ignition electricity. The FAA requires that the engine ignition on airplanes must be separate from the battery/generator system. Your airplane also has a battery/generator system, but it has nothing to do with the engine ignition system. If the battery/generator system on your car fails, the ignition goes dead and a tow company gets some of your hard-earned money. Your auto ignition shares the same battery/generator electrical system with the lights, radio, starter, and every other electrical item. The heart of any ignition system is the electricity, and this is where the big difference between cars and airplanes shows up. While your automobile and airplane ignition systems both accomplish the same task, the way they do it is very different. There must be a source of electricity a distributor (which tells the electricity where to go) wires to carry the electricity and the spark plugs, which ignite the fuel. Any ignition system on any reciprocating (piston) engine has the same basic components. The ignition system is what causes the fuel to burn, which results in the wonderfully loud engine noise we pilots love to hear. Do you know what the magneto check is actually proving? Let's review this important system.Ĭhecking the magnetos (let's call them mags) is really a check of the entire ignition system. It can become so automatic that I sometimes wonder if we really know what we are looking for. After a while, this procedure of checking the magnetos almost becomes automatic. The engine is set to the proper rpm, and you perform the normal routine. At the core of the run-up procedure is the magneto check.
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