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GS/TK
NAV M
Displays ground speed,
track angle and selection of
GPS and navigation mode.
PP Displays present position, altitude
and magnetic variation.
DIST BRG
TIME
Displays distance, bearing
and time information to the
destination or course selected.
Selection of fly to destination
can be accomplished
by direct entry of two
digit destination number.
WP
TGT
Accesses waypoint or target
data (landing data, variation,
motion). Selection of destination
for display/entry by
direct entry of two digit destination
number.
DATUM
ROUTE
Accesses datum and steering/
route functions.
MAL Indicator
Lamp
Lights when navigation set
malfunction is detected by
the built-in test circuitry. In
the event of an intermittent
malfunction, the system may
operate correctly but must
be cycled to OFF position
then to on, to extinguish the
MAL light.
CONTROLS/
INDICATOR
FUNCTION
BRT and DIM Keys Used to brighten or dim the
light intensity of the LCD display.
Four Line Alpha-
Numeric Display
Displays alphanumeric characters,
as determined by the
setting of the DISPLAY
switch, the MODE switch
and operation keyboard.
The keys activate function
upon release and are to be
released immediately after
being depressed.
TGT STR Key Stores present position data
in the indicated target store/
memory location (90-99)
when depressed and released.
KYBD Key Used in conjunction with the
keyboard to allow data display
and entry into computer.
Keyboard and LTR
Keys
Used to set up data for entry
into memory. When DISPLAY
switch is set to a position
in which new data is required
and KYBD key is
pressed, data may be displayed
on the appropriate input
field of display. To display
a number, press the
corresponding key or keys
(6 through 9). To display a
letter, first depress the LTR
key corresponding to the
position of the desired letter
on a key. Then depress the
key which contains the desired
letter. Example: To enter
an L, first depress the
LTR RIGHT key then depress
the 4 key.
INC and DEC Keys Used to increment or decrement
the displaced WAYpoint/
Target number when
the DIPLAY switch is set to
WP/TGT. To access P, depress
the LTR LEFT key followed
by the 6 key, display
waypoint 99 then depress
the inc key, or display waypoint
99 then depress the
INC key, or display waypoint
00 key then depress the
DEC key. Also used to increment
or decrement the Fly-
To-Destination number when
the DISPLAY switch is
TM 1-1520-240-10
3-3-18
CONTROLS/
INDICATOR
FUNCTION
set to DIST/BRG/TIME or
XTK/TKE/KEY.
ENT Key Enters data into memory (as
set up on keyboard and displayed).
This key is also
used for paging of displays.
The bottom right corner of
the display indicates “more”
when additional pages are
CONTROLS/
INDICATOR
FUNCTION
available, and “end” when
no additional pages are
available.
CLR Key Clears last entered character
when pressed once.
When pressed twice, clears
entire input field of display
keyboard control.
F1 Key Reserved for future growth.
Figure 3-3-7. Doppler/GPS Navigation System AN/ANS-128B
TM 1-1520-240-10
3-3-19
3-3-38. Modes of Operation.
Control of the AN/ASN-128B, including selection of
modes and displays, and entry and readout of data is
performed via the Computer Display Unit (CDU) front
panel. The AN/ASN-128B has four basic modes of operation:
off, navigate, test and GPS landing. In navigate
mode three submodes may be selected manually or automatically.
These are combined mode (default or primary
mode of operation), GPS only mode, or Doppler only
mode.
3-3-39. Off Mode.
In the off mode the system is inoperable. However, the
Edge lighting is lighted by an external aircraft power
source and is independent of the AN/ASN-128B mode
switch setting. Edge lighting may not be available if the
helicopter is modified with the night vision MWO.
3-3-40. Navigate Mode.
In the navigation mode (MGRS or LAT/LONG) position of
the CDU MODE switch) power is applied to all system
components, and all required outputs and functions are
provided. The Doppler radar velocity sensor (DRVS)
measures aircraft velocity, and converts analog heading,
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