[ Aviation engines; ] aircraft engine parts for optimizing environmentally acceptable fuel consumption, efficiency, and emissions of aircraft engines, namely, [ aircraft engines, ] *aircraft* fuel injectors, [ fuel mixture control devices in the nature of manual and electronically controlled fuel valves, variable orifice valves, air flow chokes, turbo chargers, intercoolers, and alternators; electronic ignition systems comprising high voltage spark ignition coils, crankshaft and camshaft posi...