Quote:
Originally Posted by orange4boy
They are used universally in light aircraft engines although they usually have two in case of failure.
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True and..
"...the vast majority of aircraft with piston engines are using magnetos as their sole ignition source. In spite of over 100 years of experience with magnetos, extensive certifications of aircraft magnetos and quality control requirements by the federal authorities,
they still fail or require maintenance, more often than any other part of an aircraft engine. Slick Service Bulletin 2-80 states that 4200 and 6200 series magnetos now being produced
should be inspected externally every 100 hrs. and internally every 500 hrs. Parts subject to wear should be replaced as necessary at this time,
magneto shaft bearings must be replaced every 1000 hrs." SOURCE:
Electronic Ignition for Aircraft 