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c. Ground speed and track — Enter. (Example; Enter
131 km/h and 024. Press KYBD pushbutton, observe
that left display freezes and TGT STR indicator blanks.
Press KYBD pushbutton and observe that left display
blanks.
d. Press keys 1, 3, and 1. Left display indicates 131.
Press KYBD pushbutton, control shifts to right display,
and right display blanks. Press keys 0, 2 and 4.
e. ENT key — Press. The entire display will blank,
and TGT STR number will reappear. Display should indicate
131 024.
3-3-21. System Initialization.
a. DEST DISP thumbwheel — P.
b. Present position spheroid and/or variation (para.
3-39) — Enter.
NOTE
Do not press ENT key after entering initial
position fix.
c. Initial fix position (para. 3-3-18 or 3-3-19) — Enter.
d. When the helicopter is sitting over or overflies the
initial fix position — ENT.
TM 1-1520-240-10
3-3-12
e. FLY-TO DEST thumbwheel — Set to desired destination.
The computer calculates a course between the
destination and the helicopter position at the time the
destination was selected.
3-3-22. Flight Procedures.
3-3-23. Update of Present Position from Stored Destination.
a. FLY-TO DEST thumbwheel — Set to destination to
be overflown.
b. DISPLAY selector — DIST/BRG-TIME.
c. KYBD pushbutton — Press and release when helicopter
is over the destination. Display freezes upon release
of the pushbutton.
NOTE
If a present position update is not desired, as
indicated by an approximately small value of
distance to go on overflying the destination,
set the DISPLAY selector to some other position;
this aborts the update mode.
d. ENT key — Press if update is required.
3-3-24. Update of Present Position from Landmark.
There are two methods for updating from landmark.
Method 1 is used if the landmark comes up unexpectedly
and the operator needs time to determine the coordinates.
Method 2 is used when the landmark update is anticipated.
a. Method 1.
(1) DISPLAY selector — PP.
(2) KYBD pushbutton — Press as landmark is
overflown. Present position display will freeze upon release
of pushbutton.
(3) Compare landmark coordinates with those
on display.
NOTE
If present position update is not desired, as
indicated by a small difference between the
display coordinates and the landmark coordinates,
set the DISPLAY selector to some other
position; this aborts the update.
(4) Landmark coordinates - Enter if difference
warrants an update.
(5) ENT key — Press if update is required.
b. Method 2.
(1) DISPLAY selector — DEST/TGT.
(2) DEST DISP thumbwheel — P. Present position
coordinates should be displayed.
(3) KYBD pushbutton — Press, observe that
display freezes.
NOTE
If present position update is not desired, as
indicated by a small difference between the
displayed coordinates and the landmark
coordinates, set the DISPLAY selector to
some other position; this aborts the update.
(4) Landmark coordinates — Manually enter via
keyboard.
(5) ENT key — Press when overflying landmark.
3-3-25. FLY-TO-DEST Operation.
a. When the FLY-TO-DEST thumbwheel is selected
to a new position, the helicopter’s present position at the
time is stored in the computer. A course is then computed
from the helicopter’s present position, as stored, to the
destination selected. If the helicopter deviates from this
course, crosstrack error (XTK) is computed.
b. Range and bearing to destination, current track
made good, and track angel error (TKE) correction are
computed from the helicopter’s present position to selected
destination.
3-3-26. Left-Right Steering Signals.
Flying the shortest distance to the destination from present
position:
a. FLY-TO-DEST thumbwheel — Select desired destination.
NOTE
If the desired destination is already selected
but an updated course is needed, then the
FLY-TO-DEST thumbwheel must be cycled to
another destination and back so the computer
will recalculate the new course.
b. DISPLAY selector — XTK/TKE.
c. Fly to keep the left display at L or R 000.0 and the
right display to L or R 000.
3-3-27. 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
preplaning a target store operation. Method 2 is used
when time is available and it is desired to store a target
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