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Most autopilots include some or all of the following components: a control unit (sometimes called the AFCS for auto-flight control system) an interface to a navigation system such as an FMS (flight management system) VOR receiver or a GPS navigator, which normally runs through a directional gyro (or a HSI-horizontal situation indicator) and various special-use switches and indicators. A simple wing leveler might control only the ailerons, while a more sophisticated three-axis system controls the elevator and rudder, as well. Although older analog autopilot controllers work well, newer digital controllers have improved performance and expanded capabilities. A controller uses the signal from the attitude sensor to manage a feedback loop that drives servomotors attached to the aircraft control surfaces to achieve the desired flight attitude. Interestingly, physicists can’t easily explain why spinning or vibrating components try to maintain a fixed orientation relative to the distant stars, so we’ll just have to accept it as a useful fact that helps us navigate. Today, modern GA systems are based on AHRS (attitude heading and reference system) technology that incorporates miniature vibrating MEMs components to sense orientation. The first autopilot was invented in 1909 by Elmer Sperry, who used a spinning gyroscope that has been in widespread use up until about 10 years ago. This is a big subject, so we’ll only look at some of the more common functions that you might find in GA aircraft.Īll autopilots rely on a device that can sense orientation regardless of acceleration or gravity loads.
#Stec 50 autopilot oscillation manuals#
It’s your responsibility to carefully review the Pilot Operating Handbook and AP manuals for your airplane to understand how your particular system works and its limitations. One warning: There are probably as many autopilot models as there are airplanes, so it will be hard to describe the exact operation of your particular autopilot in your airplane with your avionics. So, let’s review some of the basics of autopilot operations-components, basic functions, and a few important do’s and don’ts. Remember, an autopilot doesn’t necessarily do what you want it to do: It does what you tell it to do.
#Stec 50 autopilot oscillation how to#
There are times when knowing how to use an autopilot (AP) can save your life, and there are other times when it can kill you-particularly if you don’t know what you’re doing. Even in more advanced training programs, questions and misperceptions abound. Since then, I’ve found that many pilots have had a similar experience when it comes to auto-pilot training. My checkout in the plane had covered just about everything-except the autopilot, so I was left on my own to figure it out. The first time I ever engaged an autopilot, it did something completely unexpected, and I quickly turned it back off.