Instruments in an aircraft have two purposes: to display current flight conditions (such as airspeed and altitude) and to notify of unsatisfactory or dangerous conditions. Standardized colors are used to differentiate between visual messages, with green as a satisfactory condition, yellow for caution or a serious condition that needs monitoring, and red as a color for unsatisfactory or dangerous conditions.
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An aircraft propeller consists of two or more blades mounted on a central hub connected via a shaft to the engine. This can be either an extension of the engine’s crankshaft in low-horsepower engines, or a propeller shaft geared to the crankshaft in high-horsepower configurations. In either case, each blade of the propeller essentially acts as a rotating wing, which produces force that creates thrust to pull or push the aircraft through the air. The vast majority of aircraft have a “tractor” arrangement, where the propeller is mounted towards the front of the fuselage and pulls the aircraft, but there are examples of “pusher” arrangements where the propeller is mounted in the back and pushes the aircraft through the air.
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