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Cessna 172 glass cockpit12/28/2023 ![]() The gyros remain in a fixed attitude while the aircraft rotates around it. Our Cessna 172 is uses a vacuum driven system. The gyros can be driven by electrical motors or by a small vacuum pump attached to the engine, depending on aircraft panel configuration. The attitude indicator consists of three gyroscopes that maintain their attitude relative to the ground reference. For the simple case of flying straight and level we can still give some good speed estimates for the airspeed at which the aircraft will stall. ![]() And because of that fact you can’t rely solely on the airspeed to stay away from a stall. The airspeed at which a stall happens varies depending on the aircraft weight, the maneuvers that we fly, the flap configuration and many other factors like the current engine power and propeller wash onto the wings. Then we either start descending or if we still try to maintain altitude we will get into a stall situation and the wing will loose even more lift relatively quickly. If we try to fly slower and slower and we will eventually reach a point where the wing cannot generate enough lift and we can no longer fully compensate the gravitational pull. We usually only need enough lift to compensate the weight of the aircraft when we want to fly straight and level. ![]() The more airspeed that we have the more lift the wing can theoretically produce. This is the indicated airspeed and is typically measured in knots, giving us a speed in KIAS, knots indicated airspeed. The airspeed indicator uses the pitot and static pressure from small openings in the fuselage and on the wing to mechanically compute the speed of the oncoming air.
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