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- 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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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.”
Magnetos with serial number after June 2015 need to be overhauled “only“ after 12 years in service. Older magnetos must be overhauled after 4 years in service. In case of factory overhauled magnetos, the serial number stays the same, therefore this change only applies for factory new TCM magnetos.
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.
However, the 500-hour inspection is the single most important magneto service event. Whether you are an owner, flight school, commercial operator, or engine overhaul shop, you can ensure continuing trouble-free and safe service of an aircraft magneto.
- Follow The Guidance
- Magnetos 101
- Permanent?
- Field Collapse
- A Matter of Timing
- External Timing
- Choices
- Dual Mag
- Champion/Slick
- Iran
We think that guidance should be taken as a hard truth because magnetos generally do not give any warning of failure and some failure modes will cause an engine stoppage and/or catastrophic damage and engine failure in a matter of seconds. In a conversation with Dave Parker, a backcountry pilot, A&P, IA and proprietor of Northern Air on the Boundar...
OK, they’re black boxes with wires attached and they somehow are essential to that reciprocating thing the engine does. What goes on inside the box and why do they need to be inspected and, potentially, repaired, before my engine reaches TBO? For the engine to ignite the fuel-air vapor charge in the cylinder and release the stored energy of the gas...
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. Maintenance technicians we spoke with said that calendar ag...
The cam that opens the breaker points is set to act the moment ignition is desired. When the circuit is broken by opening the points the magnetic field in the coil collapses—that causes a voltage spike in the primary coil of 200 to 300 volts. One of the challenges to longevity of a magneto is that the breaker points cannot move from fully closed to...
The magneto has to send the high voltage shot of electricity to each spark plug at the right split second, every single time. That means that the mag has to be timed internally and externally. To set the internal timing, the magneto has to be removed from the engine and opened up. Another reason that a mag should be pulled and inspected every 500 h...
External timing is performed with the mags on the engine and is ordinarily done at the annual inspection and during 100-hour inspections. The process involves pulling a spark plug in the number-one cylinder and rotating the crankshaft until the number-one piston is at the firing position specified for that type engine—usually 20 to 24 degrees befor...
There are only two manufacturers of mags. Depending on your type of engine, you may or may not have a choice. First: 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. They do not fit on all engines. The S-20/S-200 s...
The original D2000 mag was not reliable. Our nonscientific review indicated that there are few in use—they’ve been replaced by the D3000. Short background—the dual mag consists of two independent magnetos packaged in one container, albeit with a single drive shaft and mounted on a single pad on the accessory case. The original goal was to take up l...
The other mag manufacturer is Champion, which makes what were formerly known as Slick mags. They are smaller than comparable Bendix mags and less expensive. Our most recent review of prices revealed prices for overhauled Slick mags in the $1000 range, with new from $1859 to $2049.
As we said above, when your mags hit 500 hours in service, we recommend yanking them and sending them out to a specialized shop for IRAN. We suggest IRAN rather than overhauling as an IRAN involves inspecting and replacing parts only as needed. An overhaul requires that the shop replace all of a specific list of parts, even if some or all of them a...
- 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 5, 1999 · If you ever experience high-altitude misfire in flight, the first thing you should dois throttle back. This will reduce the combustion-chamber pressure in the vicinity of thespark plug electrodes, and make it easier for the spark to occur where it's supposed tooccur.
