Look for evidence of arcing.
Aircraft ignition ceramic cigarettes.
One is that the usual pre flight mag check is a laughably inadequate test of ignition system performance.
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Replacing one magneto with the eis 41000tlh will typically improve fuel economy on average by 10 15 many operators have reported consistent fuel savings of 1gph or greater.
Keep the spark plug ceramic barrel and harness insulator clean.
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We also stock aero lite lead repair kits.
If faa pma harness is mandatory or if for use with 3 4 spark plugs use slick bendix aero lite or champion harnesses.
While trying to track down my problem with a non firing 5 bottom plug the ignition system repeatedly showed no problems whatsoever during the pre flight mag check only to fail immediately and repeatably as soon as the aircraft was in flight.
Inspect the ignition harness cigarette springs where they contact the spark plug in the barrel.
Aircraft ignition harnesses are key to the starting of your aircraft.
This is a bad connection.
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Quality aircraft accessories qaa stocks a wide variety of aircraft ignition harnesses including aero lite kelly and slick by champion.