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set to UTM
(Center Display) Present position UTN
zone.
(Left Display) Present position UTM
square designator and
easting in km to nearest
10 meters.
(Right Display) Present position UTM
northing in km nearest 10
meters.
PP with MODE switch
set to LAT/LONG
(Left Display) Present latitude position
in degrees, minutes, and
tenths of minutes.
(Right Display) Present longitude position
in degrees, minutes,
and tenths of minutes.
DIST/BRG/TIME
(Center Display) Time to the destination
set on FLY-TO DEST
thumbwheel in minutes
and tenths of minutes.
(Left Display) Distance to the destination
set on FLY-TO DEST
thumbwheel in km and
tenths of a km.
(Right Display) Bearing to the destination
set on FLY- TO DEST
thumbwheel is degrees.
Bearing is also indicated
by the No. 1 bearing
pointer on both HSIs.
DEST/TGT
(Center Display) UTM zone of destination
set on DEST DISP
thumbwheel.
(Left Display) UTM square designator
and easting or latitude (N
84
to S 80
approx) of
destination set on DEST
DISP thumbwheel.
TM 1-1520-240-10
3-3-8
CONTROLS/
INDICATOR
FUNCTION
SPH/VAR
(Left Display) Spheroid code of designation
set on DEST DISP
thumbwheel.
(Right Display) Magnetic variation (in degrees
and tenths of degrees)
of destination set
on DEST DISP thumbwheel.
MAL Indicator Lamp Lights when set malfunctions.
In case of an intermittent
malfunction, system
may operate correctly,
but must be cycled to
OFF and then to on to
put MAL light off.
MEM Indicator Lamp Lights when radar portion
of set is not tracking. May
occur over smooth water.
DIM Control Controls light intensity of
display characters.
Left, Right, and Center
Display Lamp
Alphanumeric and numeric
characters that display
data as determined
by setting of DISPLAY
switch, mode switch, and
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
keyboard to allow data
entry. KYBD pushbutton
is always lighted when
system is on.
DEST DISP Thumbwheel
Switch
Destination display
thumbwheel switch is
used along with DEST/
TGT and SPH/VAR positions
of DISPLAY switch
to select destinations
whose coordinates or
magnetic variation to be
displayed or entered.
Destinations are 0
through 9, P (present
position) and H (home).
CONTROLS/
INDICATOR
FUNCTION
Keyboard Used to enter data into
system. Keys set up data
on display. All resulting
actions are initiated upon
release of the key.
FLY-TO-DEST Thumbwheel
Switch
Selects destination to
which steering information
is desired. Destinations
are 0 through 9, P
(present position) and H
(home).
ENT Key Enters data set up on
keyboard into memory
when pressed.
CLR Key Clears last entered character
when pressed
once. Clears entire display
panel under keyboard
control when
pressed twice.
3-3-13. Display and Keyboard Operation.
In LAT/LONG coordinates, the two fields of control are
the left and right displays. In UTM coordinates, the first
field of control is the center display and the second field
is the combination of the left and right displays. When
pressing the KYBD pushbutton, one or other of the fields
described above is under control. If it is not desired to
change the information in the field under control, the pilot
can advance to the next field of the display panel by
pressing the KYBD pushbutton again.
3-3-14. Data Entry
To enter a number, press the corresponding key. To enter
a letter, first press the key corresponding to the desired
letter. Then press a key in the LEFT, MID, or RIGHT
column corresponding to the position of the letter on the
pushbutton.
Example: To enter an L, first press L, then either 3, 6, or
9 in the RIGHT column. The computer program is designed
to reject unacceptable data (for example, a UTM
area of WI does not exists, and will be rejected). If the
operator attempts to insert unacceptable data, the display
will be blank after ENT is pressed.
3-3-15. Starting Procedure.
a. MODE selector — LAMP TEST. All lights and lamp
　
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