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3. DEST DISP thumbwheel - P, numerical, or H, as
desired.
4. Present position or destination - Enter. (Example:
Entry ofN41 degrees 10.1 minutes and
EO 35 degrees 50.2 minutes.) Press KYBD
pushbutton. Observe that display freezes and
TGT STR indicator blanks. Press KYBD
pushbutton again and observe left display
blanks. To enter latitude press keys 5, 5, 4, 1,
1, 0 and 1. To enter longitude press KYBD
pushbutton (right display should clear) and
keys 2, 2, 0, 3, 5, 5, 0, and 2
5 ENT pushbutton - Press. Entire display will
blank and TGT STR number will reappear.
Display should indicate N41 degrees 10.1 EO
35 degrees 50.2.
h. Entering Ground Speed and Track.
1. MODE selector switch - BACK UP.
2. DISPLAY selector switch - GS-TK.
3. Ground speed and track - Enter. (Example:
Enter 131 km/h and 024 degrees). Press
KYBD pushbutton. Observe that left display
freezes and TGT STR indicator blanks. To enter
ground speed press keys 1, 3 and 1. Left
display blanks: To enter track angle press
keys 0, 2, and 4.
4. ENT pushbutton - Press. The entire display
will blank, and TGT STR number will reappear.
Display should indicate 131 024 degrees.
I. Initial Data Entry. Initial data entry variation
coordinates are normally done prior to takeoff. To make
the initial data entry, do the following:
1 Present position variation - Enter (para
3.14.7.f).
2. DISPLAY selector switch - DEST-TGT.
3. DEST DISP thumbwheel - P. Do not press
ENT key now.
4. ENT pushbutton - Press as helicopter is sitting
over or overflies initial fix position.
5. FLY-TO DEST thumbwheel - Desired destination
location.
3.14.8 Operating Procedures.
a. Update of Present Position From Stored Destination.
The helicopter is flying to a destination set
by the FLY TO DEST thumbwheel. When the helicopter
is over the destination, the computer updates the
present position when the KYBD pushbutton is
pressed. This is accomplished by using stored destination
coordinates for the destination number shown in
FLY TO DEST window and adding to them the distance
traveled between the time the KYBD pushbutton
was pressed and the ENT key was pressed.
1. DISPLAY selector switch - DIST/BRGTIME.
2. KYBD pushbutton - Press when helicopter is
over the destination. Display freezes.
NOTE
If a present position update is not desired
as indicated by an appropriately small
value of distance to go on overflying the
destination, set the DISPLAY selector to
some other position. This aborts the update
mode.
3. ENT key - Press.
3-44 Change 3
TM 1-1520-238-10
b. Update of Present Position From Landmark.
There are two methods for updating present position
from a landmark. Method 1 is useful if the landmark
comes up unexpectedly and the operator needs time to
determine the coordinates. Method 2 is used when a
landmark update is anticipated.
1. Method 1.
a. DISPLAY selector switch PP.
b. KYBD pushbutton Press as landmark is
overflown. Present position display will
freeze. Compare landmark coordinates
with those on display.
(1) Landmark coordinates Enter. If difference
warrant an update.
(2) ENT key Press if update is required.
3) DISPLAY selector switch Set to some other
position to abort update.
2. Method 2
a. DISPLAY selector switch DEST/TGT.
b. DEST DISP thumbwheel P Present position
coordinates should be displayed.
c. KYBD pushbutton Press. Observe that
display freezes.
d. Landmark coordinates Manually enter via
keyboard.
e. ENT key Press when overflying landmark.
f. DISPLAY selector switch Set to some other
position to abort update.
c. Left-Right Steering Signals. Flying shortest
distance to destination from present position:
1. DISPLAY selector switch XTK-TKE.
2. MODE selector switch UTM.
3. To center the pointer, fly the helicopter in the
direction of the course deviation bar on the HSI.
d. Target Store (TGT STR) Operation. Two methods
may be used for target store operation. Method 1 is
normally used when time is not available for
preplanning a target store operation. Method 2 is
used when time is available and it is desired to store
a target in a specific DEST DISP position.
1. Method 1.
a. TGT STR pushbutton Press when flying over
target. Present position is automatically stored and
the destination location is that which was displayed
in the target store indicator (position 6, 7, 8, or 9)
immediately before pressing the TGT STR
pushbutton.
2. Method 2.
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