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employed only in polar regions of the earth where magnetic
references are unreliable. However, it can be useful
if the slaving system malfunctions. For proper operation,
the latitude controls on the directional gyro (fig. 3-3-4)
must be set to the local latitude.
Figure 3-3-3. Gyromagnetic Compass Set Control
Panel
TM 1-1520-240-10
3-3-5
NOTE
If synchronizing becomes necessary in flight
with the AFCS on, position the SWIVEL
switch to UNLOCK. After synchronization is
complete, position the SWIVEL switch to
LOCK. This prevents unwanted yaw axis inputs.
c. Manual Synchronization. If power has been applied
to the system with the compass slaving switch at
FREE or if the system has been operated in the free
directional gyro mode for a period of time, the compass
cards will not be aligned with the magnetic heading of the
helicopter. The system can be reset to the correct magnetic
heading by pushing and turning the PUSH TO SET
knob in the direction of the symbol indicated by the annunciator
pointer until the pointer is centered. If the slaving
switch is then set to SLAVED, the compass cards will
maintain correct magnetic heading.
Figure 3-3-4. Directional Gyro (CN-998/ASN-43)
3-3-11. Doppler Navigation Set (AN/ASN-128).
NOTE
When the Airborne Navigation Set AN/
ASN-149 (Global Positioning System GPS) is
installed, the Doppler Navigation Set AN/
ASN-128 is controlled by the GPS CDU. For
a description of the Airborne navigation Set
and Doppler Navigation Set.
a. The doppler navigation set (fig. 3-3-5) is a selfcontained
navigation system that does not require any
ground-based aids. The system provides worldwide navigation
with position readout available in both universal
transverse mercator (grid) (UTM) and latitude and longitude
(lat/long). Navigation and steering is done using
lat/long coordinates, and bilateral UTM-lat/long conversion
routine is provided for UTM operation.
b. The system in conjunction with heading data from
the gyro compass, and pitch and roll data from the copilot’s
attitude gyro, provides velocity, position, and steering
information from ground level to 10,000 feet.
c. The computer-display unit (CDU) is on the canted
console, between the pilot and copilot positions. Course
deviation, bearing, distance to destination, and NAV GO/
NOGO are also presented to the HSI. Built in test equipment
(BITE) continuously monitors system operation. If
a failure occurs, a malfunction indicator lamp will light
and coded data, indicating the failed component, will be
displayed on the CDU when the MODE switch is set to
TEST. Power to operate the set is supplied by the No. 2
DC bus through the NAV DOPPLER circuit breaker on
the No. 2 PDP, and the No. 1 AC instrument bus through
the NAV DOPPLER circuit breaker on the No. 1 PDP.
TM 1-1520-240-10
3-3-6
Figure 3-3-5. Doppler Navigation Set Control (AN/ASN-128)
TM 1-1520-240-10
3-3-7
3-3-12. Controls and Function -— Doppler Navigation
Set. (fig. 3-3-5 and table 3-3-2)
CONTROLS/
INDICATOR
FUNCTION
MODE Selector Selects doppler navigation
mode of operation as
follows:
OFF Turns set off. Pull knob
out to move from, or to
this position.
LAMP TEST Checks operation of all
lamps and lamp segments.
TEST Initiates (BIT) for set.
System reverts to backup
navigation operation during
mode.
UTM Selects universal transverse
mercator coordinate
system for display
and insertion of information.
LAT/LONG Select latitude/longitude
coordinate system for
display and insertion of
information.
BACKUP Places set in remembered
velocity mode of
operation.
DISPLAY Selector Selects navigation data
for display as follows:
WIND SP/DIR Used only with BACKUP
mode.
(Left Display) Windspeed kilometer(s)
per hour.
(Right Display) Direction (degrees) relative
to true north.
XTK/TKE
(Left Display) Distance crosstrack error
(XTK) in km and tenths of
a km left or right of helicopter.
Track error will
also be displayed by the
course deviation indicator
(CDI) on the HSI when
DOP.
SEL on the HSI MODE
SELECT panel is
pressed.
(Right Display) Track angle error (TKE)
in degrees and right or
left of present helicopter
heading.
CONTROLS/
INDICATOR
FUNCTION
GS/TK
(Left Display) Ground speed (GS) in
km/hr.
(Right Display) Track angle in degrees
relative to true north.
PP with mode switch
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