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function to that frequency. S will display or be
removed from the left of channel number.
3-44
TM 1-1520-248-10
16. SEL ADD key  Press as required to manual frequency. Manual frequency entered
override (OFF) or initiate (ON) use of is now set for transmitting and receiving.
selective address function. ON and OFF will
alternate next to SEL ADD key each time key
is pressed. 3-45. SETTING KY-75 FOR USE WITH HF
RADIO.
NOTE
1. COMM key (or DSPL SEL switch)  Press.
Once SEL ADD mode has been entered and COMM page (fig. 3-7) will display.
the radio keyed, the mode cannot be
reentered until another radio command 2. COMSEC key  Press. COMSEC page (fig.
(channel up/down, scan, tune) has been 3-22) will display.
given.
3. Radio  Select HF by placing radio select
switch on pilot collective control head (fig. 3-
3-44. CHANGING FREQUENCY USING 3) to position 4 or rotating transmit selector
MANUAL FREQUENCY ENTRY, RFD, AND switch on the CSC panel (fig. 3-2) to position
REMOTE CONTROL HF. 4. HF will display at lower center of screen.
NOTE NOTE
The transmit select switch on the CSC must For HF operations, use keys under HF
be in RMT before remote selection of RFD heading in lower left and lower right portions
displays. of the MFD screen.
1. Radio  Select HF by placing radio select 4. FILL SEL key  Press until desired fill
switch on pilot collective control head (fig. 3- number displays in box. Fill number will
3) to position 4, or rotating transmit selector alternate between 1, 2, and 3 each time key
switch on the CSC panel (fig. 3-2) to position is pressed.
4. Arrow pointing to crewmember tuning HF
radio will move to HF line on RFD (fig. 3-1). 5. SIGNAL key  Press as required. Mode will
alternate between SIGNAL OFF and SIGNAL
2. CHAN switch  Press up or down until M is ON each time key is pressed, HF is now set
displayed in channel block of RFD. M4 (last t o b e p u t i n c i p h e r mode f o r s e c u r e
manual frequency entered) will be displayed operations.
for HF.
3. CHAN switch  Press to KYBD position.
MFK is activated to enter new frequency into
HF.
4. Frequency number  Enter on MFK, pressing
first two digits, decimal point and last four
digits. Frequency will display on RFD as it is
typed.
NOTE
It is not necessary to enter a zero (0) before
the first two digits. Also, system will assume
zeros for digits after decimal point if nothing
is entered.
5. ENTER key  Press. Frequency selected will
be manually tuned into HF replacing previous
3-45
TM 1-1520-248-10
SECTION III. NAVIGATION
3-46. NAVIGATION SYSTEM. MSL w i t h t h e a c c u r a c y r e q u i r e d b y m i s s i o n
requirements when range, bearing, and declination to
This section provides information on the Embedded target is provided to the navigation subsystem from
Global Positioning System/Inertial Navigation System MMS.
(EGI). The navigation system provides the navigation
modes, functions, and displays. Navigation i s
performed through the CDS using the EGI, radar 3 - 5 1 . KNOWN LANDMARK POSITION
altimeter, and the laser range finder/designator (LRF/ D). Navigation information is displayed on the two UPDATING.
MFDs through the various display modes. An important
function of the navigation system is the capability of Provides the capability of updating the helicopter
storing waypoint and target information for making flight position and a l t i t u d e with range, bearing, and
plan routes and capability of changing these routes as declination to a known landmark or prestored waypoint
a mission may change. provided by the MMS or by direct observation.
3 - 4 7 . N A V I G A T I O N S U B S Y S T E M 3-52. SYSTEM ALIGNMENT CAPABILITIES.
FUNCTIONS.
Provides the capability of alignment on the ground
using automatic GPS alignment, manual data entry or
3-48. ENROUTE NAVIGATION. stored waypoint data. A stored heading alignment may
be accomplished, providing the aircraft has not been
Provides point-to-point guidance from helicopter takeoff
moved from its position and orientation at the last
to destination using information provided by the data
previous time of system shutdown. It also provides the
bus which consists of the following:
capabilities of airborne and shipboard alignment.
Alignment modes may be selected and executed
a. Aircraft heading, attitude, and position. manually.
b. Bearing and range to selected destinations
and navigational waypoints. 3-53. EGI SYSTEM DESCRIPTION.
c. Aircraft ground track and groundspeed The EGI i s l o c a t e d i n t h e l e f t - s i d e a v i o n i c s
　
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