They are used for secondary load distribution and offer multiple poles and form C (changeover) contact configurations. Environment — Temperature range, fluids, pressure cycles, icing, salt fog, vibration. EMI/EMC — Shielding level; filtered inserts or 360° braid termination. Mating style — Threaded for harsh vibration; bayonet for quick access; push-pull for compact instruments. Contact mix — Sizes. Advisory circulars are intended to provide advice and guidance to illustrate a means, but not necessarily the only means, of complying with the Regulations, or to explain certain regulatory requirements by providing informative, interpretative and explanatory material. The spark plugs in certified piston aircraft engines are powered by engine-driven magnetos, so no additional electrical power is required for. Some commonly used connectors are shown in Figure 1. AN connectors There are five basic classes of AN connectors used in most aircraft. Classes A, B, C, and D are made of aluminum, and class K is made of steel.
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