Table 3-12. AN/ASN-128 Control and Indicator Functions continued

Table 3-12. AN/ASN-128 Control and Indicator Functions continued - TM-1-1520-238-10_200

TM-1-1520-238-10 Helicopter Attack AH-64A Apache Manual
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TM 1-1520-238-10 3-40 Change 3 Table 3-12. AN/ASN-128 Control and Indicator Functions – continued Control/Indicator Function (Right Display) Longitude of destination set on DEST DISP thumbwheel. SPH-VAR (left Display) Spheroid code of destination set on DEST DISP thumbwheel. (Right Display) Magnetic variation (in degrees and tenths of degrees) of destination set on DEST DISP thumbwheel. MEM Indicator Lamp Lights when radar portion of navigation set is in nontrack condition. MAL Indicator Lamp Lights when navigation set malfunction is detected by built in self-test. DIM Control Control light intensity of display characters. Left, Right, and Center Display Lamps Lights to provide data in alphanumeric and numeric characters, as determined by setting of DISPLAY switch, MODE switch, and operation of keyboard. Target Storage Indicator Displays destination number (memory location) in which present position will be stored when TGT STR pushbutton is pressed. TGT STR Pushbutton Stores present position data when pressed. KYBD Pushbutton Used in conjunction with the keyboard to allow data to be entered into the computer. Also lights up keyboard when pushed the first time. DEST DISP Thumbwheel switch DISPLAY Destination display thumbwheel switch is used along with DEST-TGT and SPH-VAR position of switch to select destination whose coordinates or magnetic variation are to be displayed or entered. Destinations are 0 though 9, P (Present Position) and H (Home). Keyboard Used to set up data for entry into memory. When the DISPLAY switch is tuned to the position in which new data is required and the KYBD pushbutton is pressed, data may be displayed on the appropriate left, right, and center display. To display a number, press the corresponding key or keys (1 through 0). To display a letter, first depress the key corresponding to the desired letter. Then depress a key in the left, middle, or right column, corresponding to the position of the letter on the key. Example: to enter an L, first depress L, then 3, 6, or 9 in the right column. FLY-TO DEST Thumbwheel switch Selects the destination for which XTK/TKE and DIST/BRG/TIME are displayed when the DISPLAY switch is turned to either of these positions from which steering information is desired. Destinations are 0 through 9, and H (Home). ENT key Enters data set up on keyboard into memory when pressed. CLR key Clears last entered character when pressed once. When pressed twice, clears entire display panel under keyboard control.

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