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Data Entry Keyboard The data entry keyboard is used to enter, display, modify, or transmit initialization, leg change and flight plan data. The data entry keyboard consists of the following: cue light illuminates to indicate that operator action is required. The clear key is used to remove entered data and clear the display. A cue light illuminates to indicate that operator action is required. key is used to select the number and position of the previous waypoint for display when the WPT cue light is illuminated. The magnetic/true north key is used to indicate north reference. When the M cue light is illuminated, the NDU displays data referenced to magnetic north. When the T cue light is illuminated, the NDU displays data referenced to true north. The bright/dim
key is used to start a test of all NDU annunciators, cue lights and display. keys are used to select data for display from IRU1, IRU2, or IRU3. The NDU displays data from one IRU at a time. The selected IRUs cue light is illuminated. waypoints. When this key is repeatedly pressed, the NDU displays the successive flight plan waypoints by number and position. key is used to define or modify the current flight plan leg by displaying the FROM and TO waypoint numbers. The current leg must be defined before navigation data can be defined and displayed. key is used to select and display the crosstrack error in nautical miles from the current leg and the desired track of that leg. key is used to select and display the distance and time to the TO waypoint based upon present position and current ground speed. key is used to select and display the current track and ground speed. key is used to initialize and display the present position of the airplane. key is used to select and display the current wind direction and wind speed. |