Solid state devices Bridfes and monitors Synchros Servo motors and tach rate generators Gyros Compass systems Inertial navigation system (INS)| Automatic direction finder (ADF) Omega navigation system (ONS) Very high frequency Omni range (VOR) Instrument landing category II systems Air traffic control system (ATC) Distance measuring equipment (DME) Marker beacon system Radio altimeter principle Air data systems Theory of flight and aircraft control surfaces Ground proximity warning system (GPWS) Autopilots and flight directors Autopilot yaw damper Rudder channel Automatic flight guidance systems Autopilot flight director roll channel Autopilot flight director pitch channel Area navigation (RNAV) Flight management comoputer system (FMCS) .
