TM 1-1520-238-103-64.6Change 8Access to NAV system pages is accomplished using Variable Action Buttons (VABs) located on either side of the CDUdisplay screen. Refer to table 3-22.1 for their respective function. There are three (3) NAV system pages: ADMIN, HoverBias Calibration Mode (HBCM), and Offset Update (OFS UPDT).Table 3-22.1.NAV TOP LEVEL PAGE VARIABLE ACTION BUTTONS Control/DisplayFunctionVAB 1If NAVSTAT 1 is displayed on line 6 of the NAV page, VAB 1 is disabled.Depressing the VAB 1 button with no data present in the scratchpad freezes the currentdisplayed PPOS data and changes the PPOS legend to UPD indicating the system is readyfor a manual PPOS update. A second depression of VAB 1 with no scratchpad data presentaborts the manual update.Depressing the VAB 1 button with data present in the scratchpad that satisfies the PPOS,Datum, or MAGVAR data entry rules will cause the intended system parameter to beupdated.Used for manually entering PPOS and Datum updates. Allows manual MAGVAR updateswhen the outlined arrow is displayed in character position 1 on line 2.VAB 2Not Active.VAB 3Not Active.VAB 4When depressed, if the left–hand character field in line 7. displays the legend UPD TO, willcomplete a flyover type PPOS update; and display updated PPOS on line 1. When updateddata is accepted or aborted, line 7. will return to its’ previous legend of FLY TO.With valid FLY TO data symbol (WXX or TXX with valid previously entered coordinates)entered on the scratchpad, will change the active FLY TO to location entered in scratchpad.Invalid scratchpad coordinate data will result in ‘‘ERROR” message on scratchpad.Without data in scratchpad; will display active FLY TO coordinates in scratchpad with initialdepression. Second depression will display the Associated data line (ID, Altitude and Datum)for the active FLY TOcoordinates. Subsequent depressions will toggle between the FLY TOcoordinates and the Associated Data. FLY TO coordinates and Associated Data displayed inthe scratchpad are for review purposes only, and cannot be edited or transferred.VAB 5If NAVSTAT 1 is displayed on line 6. of the NAV page, VAB 5 is disabled.Depression of VAB 5 with other than NAVSTAT 1 status while overflying a waypoint willfreeze the PPOS display on line 1. and changes the FLY TO legend on line 7. to UPD TO.Reselection of VAB 5, or selection of any other page, will abort the update.VAB 6Presents the ADMIN sub page when depressed.VAB 7Not Active.VAB 8Not Active.
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