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Five years
- In addition, magnetos must be overhauled or replaced five years after the date of manufacture or last overhaul or four years after the date placed in service, whichever occurs first, without regard to accumulated operating hours since new or last overhaul.”
www.qaa.com/resource-center/aircraft-accessory-faqs/bendix-magneto-faqs
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Should a magneto be overhauled?
What is Magneto repair & overhaul?
How long does a magneto last?
What are the signs that my Magneto needs repair?
When do I have to Overhaul my Bendix Magnetos? The Bendix Magneto overhaul manual states: “Magnetos are subject to the same environmental conditions and wear as the engine and must be overhauled when the engine is overhauled.
Magnetos must be overhauled after a lightning strike on the aircraft, a sudden stoppage, prop strike, overspeed or immersion. TCM Continental also specify a 4 year calendar time overhaul for Bendix magnetos irrespective of operational time.
- Magnetic Field Collapse
- High-Altitude Misfire
- Dealing with Misfire
- Mag Check
- Choices
- Iran v. Overhaul
- Conclusion
The cam is set to open the breaker points the moment ignition is desired. With the circuit suddenly broken, the magnetic field in the coil collapses and causes a voltage spike in the primary coil of 200 to 300 volts. As the breaker points begin to separate and the voltage spike occurs in the primary coil, the electrical energy will attempt to arc a...
Air helps prevent arcing between the electrodes in the distributor—it’s a natural insulator. As the airplane climbs and the air gets thinner, its insulating properties diminish, making arcing and engine misfire more likely. We’ve experienced misfire when flying in the flight levels—and we can say with certainty that it’s a scary event. The immediat...
If you experience an engine that starts running rough, do a mag check. If the engine smooths out on one mag, but continues to run rough on the other—shut off the mag that is causing the engine to run rough. A failure within a mag that causes the engine to misfire is potentially serious. Misfiring can lead to detonation and catastrophic failure of t...
The mag check you do during the pre-takeoff engine run-up will usually only reveal gross problems with the ignition system. Which means, if the max RPM drop or difference in RPM drop between the mags doesn’t fall within the engine manufacturer’s parameters, you’ve got something wrong that is significant enough that it needs to be dealt with prior t...
There are two manufacturers of magnetos and, depending on the type of engine on your airplane, you may or may not have a magneto choice. Bendix mags, now manufactured by Continental, come in three main types. The S-1200 series are large, robust, hot-sparking mags that are often used on airplanes that fly at high altitude—although they do not fit on...
When your Bendix mags hit 500 hours in service, we recommend yanking them and sending them out to a specialized magneto shop for IRAN. For Slicks, we suggest getting an estimate for IRAN versus checking prices for rebuilt units—as they may be comparable and it can be faster to simply get rebuilt mags. We do not recommend overhauling a magneto. To t...
Until there is a way to affordably certify electronic ignition for general aviation aircraft, magnetos are going to continue firing spark plugs. They are reliable, robust devices that nevertheless need to be precisely timed—and the timing checked regularly. Accept that the components wear, and that a mag is not going to last until engine TBO, so pl...
- Rick Durden
There are two ways to tell if your magnetos require overhaul or repair: by identifying mag-related problems with engine performance, and by diagnosing damage and wear through routine maintenance and inspection. How to Know When Your Magnetos Are Performing Poorly.
Jun 7, 2017 · The correct magneto configuration should be verified against the approved technical data. Their essential simplicity means magnetos can be overhauled and refurbished many times but some of the components have inherently limited lives.
Jan 20, 2022 · A permanent magnet in a magneto isn’t permanent, just as the hairstyle labeled a permanent doesn’t last forever. However, the magnet does retain its magnetism for years, and is re-magnetized when the mag is opened for overhaul or repair. That’s one reason a mag won’t last until engine TBO.
The 500-hour magneto inspection is critical to the safe operation of magnetos. While not a required service action as an airworthiness directive, it is considered critical and mandatory by magneto OEM’s and is considered a good, common-sense maintenance practice by aircraft mechanics.
