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Table 3-12. AN/ASN-128 Control and Indicator Functions - continued
Control/Indicator Function
(Right Display) Wind direction relative to true north (degrees) All references to headings or track angle
degrees are referred to magnetic north.
XTK-TKE (Left Distance crosstrack (XTK) of initial course to destination in km and tenths of a km.
Display)
(Right Display) Track angle error (TKE) in degrees displayed as right or left of bearing to destination.
GS-TK (Left Ground speed (GS) in km/hr.
Display)
(Right Display) Track angle (TK) in degrees.
PP (MODE
switch set to
UTM)
(Center Display) Present position UTM zone.
(Left Display) Present position UTM area square designator and easting in km to nearest ten meters.
(Right Display) Present position UTM area northing in km to nearest ten meters.
PP (MODE
switch set to
LATT/LONG)
(Left Display) Present position longitude in degrees, minutes, and tenths of minutes.
(Right Display) Present position latitude in degrees, minutes, and tenths of minutes.
DIST/BRG-TIME
(Center Display) Time to destination selected by FLY TO DEST (in minutes and tenths of minutes).
(Left Display) Distance to destination selected by FLY TO DEST (in km and tenths of a km).
(Right Display) Bearing to a destination selected by FLY TO DEST (in degrees).
DEST-TGT (Mode
switch set to UTM)
(Center Display) UTM zone of destination selected by DEST DISP thumbwheel.
(Left Display) UTM area and easting of destination set on DEST DISP thumbwheel.
(Right Display) Northing of destination set on DEST DISP thumbwheel.
DEST-TGT (Mode
switch set to
LATT/LONG)
(Left display) Latitude (N 84° or S 80° max.) of destination set on DEST DISP thumbwheel.
Change 3 3-39
TM 1-1520-238-10
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 Lights when radar portion of navigation set is in nontrack condition.
Lamp
MAL Indicator Lights when navigation set malfunction is detected by built in self-test.
Lamp
DIM Control Control light intensity of display characters.
Left, Right, and Lights to provide data in alphanumeric and numeric characters, as determined by
Center Display setting of DISPLAY switch, MODE switch, and operation of keyboard.
Lamps
Target Storage Displays destination number (memory location) in which present position will be stored
Indicator when TGT STR pushbutton is pressed.
TGT STR Stores present position data when pressed.
Pushbutton
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 Destination display thumbwheel switch is used along with DEST-TGT and SPH-VAR
Thumbwheel switch position of switch to select destination whose coordinates or magnetic variation are to be
DISPLAY 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 Selects the destination for which XTK/TKE and DIST/BRG/TIME are displayed when
Thumbwheel switch 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.
3-40 Change 3
TM 1-1520-238-10
b. Navigate Mode. In the navigate mode (UTM or
LATT/LONG position of the MODE selector switch),
power is applied to all system components, and all
required outputs and functions are provided. Changes in
present position are computed and added to initial
position to determine the instantaneous latitude/longitude
of the helicopter. Destination and present position
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