Pressure sensors; acceleration sensors; optical sensors; proximity sensors; electric sensors; motion sensors; timing sensors; liquid level sensors; electronic proximity sensors and switches; sensors for the determination of temperatures, positions and distances; sensors for determining position, velocity, acceleration, altitude, airspeed and temperature; electronic sensing instruments and devices to monitor aerospace components, namely, cooling systems, fuel systems, turbines, combustion chambers, compressors, shafts, diffusers, air intakes, fans, ducts, inlets, nozzles, doors, landing systems, and locking mechanisms.