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storing, position update, and cueing.
4.17.1 Waypoint/Targeting Data Entry. The waypoint/
targeting function requires certain data. The
data is input using both the TGT and SPl positions on
the DEK rotary switch. The data entered under SPl is
displayed as a menu with two pages. They are:
(1) FCC Present Position Data. The FCC present
position (PPOS) data are used only for the initial
alignment of the HARS when the helicopter is on the
ground. The present position shall be entered prior to a
normal or fast alignment of the HARS. It is not required
for a stored heading alignment or inflight restart.
The accuracy of the present position input should
be within 500 - 750 meters, straight line distance, from
the actual location. Inflight this display will periodically
update reflecting the doppler present position. The
doppler display updates at a substantially higher rate
than the PPOS display, consequently there may not be
any correlation of the doppler and PPOS display in forward
flight. This is normal and does not indicate a
problem condition. If at any time ?? appear following
the PPOS data, as shown in the example, the FCC is rejecting
the doppler navigation data as being in error.
This may be an indication of doppler malfunction or
that the doppler has not been updated recently. The displayed
PPOS data, in this case, will then reflect the
best computed present position based on HARS velocity
data.
(2) Altitude and Altimeter Data. The altitude
and altimeter setting data are to be used in the following
manner: Altitude above mean sea level shall be entered
when the aircraft is on the ground. The value is
determined from referring to navigational charts or by
tactical map study. The Fire Control System will compute
the corresponding altimeter setting. The altimeter
setting shall be entered when the aircraft is in flight.
The altitude display may be observed in flight; if an error
exists in the dynamic altitude display when
compared to the aircraft barometric altimeter, the altimeter
setting should be entered. The altimeter setting
can normally be obtained from a local air traffic
control agency. In the event of a failure of the air data
sensor, question marks, ??.??, will be displayed in the
altimeter setting display. The fire control system will
attempt to derive the aircraft altitude above mean sea
level by adding radar altitude to the last valid altitude
value displayed. The altitude value should then be periodically
updated in flight. The altitude value computed
from radar altitude is accomplished based on standard
atmosphere.
(3) lime Display Functions. The TIME display
functions only when power is applied to the fire
control computer. The TIME display is not part of the
backup bus controller software. The TIME display will
increment from whatever time value is entered; on initial
power up the TIME value is zero. If a TIME value of
00:00:00 is input, the TIME display will function as an
elapsed time clock. The TIME display is a twenty-four
hour clock with an accuracy of plus or minus 1 second
while running.
a. Data Entry. To enter data input the first character
of the desired parameter. The cursor will jump to
the first digit position of the data, then input the full
data required. On completion the data will be automati
cally entered.
NOTE
The LAT/LONG conversion process within
the FCC contains non-linear transformation
errors in accordance with the table
below:
Change 4 4-17
TM 1-1520-238-10
b. Conventional Uses:
NOTE
If an erroneous magnetic variation is
entered into SPl, the aircraft heading
scale and the HSI will also indicate that
amount of error.
Entries of magnetic headings greater
than 360° or a magnetic variation entered
greater than 179.9° will be ignored.
The message ERROR will be
displayed on the upper left of the display
field prompting the operator to reenter
valid data m.
(1) Magnetic variation. Use E for East and W
for West, as appropriate.
(2) Grid Convergence m. Use E for East
and W for West, as appropriate. Data may be obtained
from G-M angle diagram on UTM maps if applicable.
(3) Spheroid. Use the same codes utilized by
the doppler.
(4) Latitude. Use - for North and S for South,
as appropriate.
4.17.2 Waypoint/Targeting Coordinate Data Storing.
Up to ten sets of coordinate data may be stored in
the FCC at anytime. Two methods can be used to store
coordinate data; these are either the data entry keyboard,
or by use of the store (ST) position of the UPDT/
　
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