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Selecting another navigational modes, automatically disengages
the mode in use, turns out the SEL legend of the
mode in use, engages the selected mode, and lights the
SEL legend of the selected mode. Each pilot may independently
select different navigational modes for display
on his HSI.
b. Pressing CMD SEL engages the AFCS heading
select feature, and will illuminate the SEL legend on the
switch. Due to electrical interlocks between the two HSI
control panels, both CMD SEL switches cannot be engaged
at the same time. The engaged switch is indicated
by the lit SEL legend. If the opposite CMD SEL switch is
pressed when operating with heading select, the HDG on
the AFCS panel will release and heading select will be
disengaged. Control of the course deviation indicator in
the VOR mode relative to bearing and course deviation
to or from a VOR is assigned to the pilot who has CMD
SEL engaged. If the pilot who does not have CMD SEL
engaged makes an adjustment on his CRS knob, it will
have no effect on the CDI relative to the course.
c. Pressing VOR/ADF pushbutton on the BRG side
selects the navigational aid, the bearing of which will be
indicated by the HSI No. 2 pointer. The switch is divided
into two segments labeled VOR and ADF. If VOR segment
is lit, the No. 2 pointer will indicate the bearing to a
VOR station to which the VHF navigation set is tuned.
Pressing the switch will cause the VOR segment to go
out and the No. 2 pointer will indicate the bearing to the
station to which the ADF set is tuned out and light the
ADF segment. The opposite action occurs if the ADF
segment is lit and the switch is pressed.
d. A MKR BCN light will illuminate during marker beacon
passage. The light labeled O comes on when passing
through an outer marker beam. The light labeled M
comes on when passing through a middle marker and
finally the light labeled I comes on when passing through
an inner marker. As each light illuminates, a distinctive
tone identifying the beacon will be heard over the interphone
(table 3-2-1). The lights have a press-to-test feature;
pressing any one of the three lamps will cause all
MKR BCN lamps to illuminate on both pilots HSI MODE
SELECT panels.
3-3-36. Doppler/GPS Navigation Set AN/ASN-128B
(DGNS).
The AN/ASN-128B DGNS is an AN/ASN-128 LDNS with
embedded GPS receiver. The AN/ANS-128B in conjunction
with the aircraft’s heading, vertical references, and
position and velocity updates from its internal GPS, provides
accurate aircraft velocity, position and steering information
from ground level to 10,000 feet. The system
provides world-wide navigation, with position readout
available in both Military Grid Reference System
(MGRS) and Latitude and Longitude (LAT/LONG) coordinates.
Navigation and steering is performed using LAT/
LONG coordinates and a bilateral MGRS-LAT/LONG
conversion routine is provided for MGRS operation. Up
to 100 destinations may be entered in either format and
not necessarily the same format.
3-3-37. Controls, Displays and Function.
The control and displays for the AN/ANS-128B are on the
front panel (fig. 3-3-7). The function of each control is as
follows:
NOTE
The MODE switch is locked in the OFF position
and must be pulled out and turned to get
into or out of OFF position.
CONTROLS/
INDICATOR
FUNCTION
MODE switch Selects navigation set mode
of operation.
OFF In this position the navigation
set is inoperable; nonvolatile
RAM retains stored
data.
LAMP TEST Checks operation of all
lamps.
TEST Initiates built-in-self-test exercise
for the Doppler and
GPS functions of the navigation
set.
TM 1-1520-240-10
3-3-17
CONTROLS/
INDICATOR
FUNCTION
MGRS Selects Military Grid-Refence
System (MGRS) navigational
mode of operation.
LAT/LONG Selects latitude/longitude
navigational mode of operation.
GPS
LDG
Places navigation set in
GPS landing mode of operation.
This mode provides
real-time, tactical precision
landing guidance information
to the HSI indicator.
DISPLAY switch Selects navigation data for
display.
WIND-UTC
DATA
Used for wind speed and direction,
UTC time, sea current,
surface wind, GPS status
and data load functions.
XTK/TKE
KEY
Displays steering (cross
track distance and track
angle error) information and
GPS variable key status.
Selection of fly to destination
by direct entry of two digit
destination number.
　
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