PTCH and WLV are also activated by other modes, so it's important to have buttons (which also serve as indicators) for these functions even if you don't plan on using them.
The reason for these four controls is that if the autopilot is first activated, pushing ONE button activates TWO autopilot modes: HOLD (also labeled ALT in some button variants)Īdditionally, either a flight director switch or mapping a joystick button to autopilot disengage is required to switch the autopilot off.In order not to lose track of the autopilot status, a plane should have at least 4 different autopilot mode switches: 1 Quick Help: Minimum Autopilot Equipment.
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