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Every 500 hours
- Your magnetos, either Slick or Bendix, should be removed and inspected every 500 hours.
www.kitplanes.com/500-hour-inspection-vs-overhaul/
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What is the maintenance & overhaul manual for slick magnetos?
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This maintenance and overhaul manual gives detailed maintenance, assembly, disassembly and troubleshooting instructions and technical information about the design and operation of Slick magnetos. PROPRIETARY STATEMENT.
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The best way to service your aircraft magnetos, of course, is to follow manufacturer’s specifications for routine inspection and progressive maintenance. With some exceptions, manufacturers generally prescribe 100- and 500-hour service schedules for all magnetos.
magnetos is every 500 hours of engine operation, with some pressurized Slick magneto models requiring more frequent inspections. Inspection requirements for all Slick magnetos are listed in Slick Service Bulletin SB2-80.
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DETAILED INSTRUCTIONS: Replace point assemblies in subject magnetos at earliest convenient maintenance time not to exceed the next scheduled maintenance period. If magnetos have more than 100 hours the points can be replaced at the next regular maintenance interval.
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- 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
Apr 18, 2021 · Your magnetos, either Slick or Bendix, should be removed and inspected every 500 hours. Experimental owners can usually stretch this out a bit, but ignition-system performance will begin to deteriorate if the mags aren’t serviced.
This Maintenance and Overhaul Manual provides Detailed maintenance, assembly, disassembly and Troubleshooting instructions and technical Information about the design and operation of Slick Magnetos. ISSUED. REVISED. Unison Industries. Cover. LOG OF REVISIONS. To: Holders of L-1363B, dated September 15, 1994.
