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segments should be lit.
(1) Left, right, center and target storage indicator
— Lit (fig. 3-3-5). All other lights should be on.
(2) Turn DIM control fully clockwise, then fully
counterclockwise, and return to full clockwise; all segments
of the display should alternately glow brightly, go
off, and then glow brightly.
TM 1-1520-240-10
3-3-9
Table 3-3-2. Computer-Display Unit Data Displays
CENTER DISPLAY LEFT DISPLAY RIGHT DISPLAY
SWITCH POSITION
DATA RANGE DATA RANGE DATA RANGE
WIND SP/DIR Windspeed 999 km/h Wind Direction
359

XTK/TKE Crosstrack Distance
Error
L/R 999.9
km
Track Angle
Error
R/L 180

GS/TK Groundspeeed 999 km/h Track 359

PP UTM UTM Zone Note 2 Area/Easting WV9999 Northing 9999
LAT/LONG Latitude N 84
00.0”
S 80
00.0”
Longitude E/W
180
00.0”
DIST/BRG/TIME Time 99.9 Min. Distance to Go 999.9 km Bearing 359

DEST/TGT UTM UTM Zone Note 2 Area/Easting WV9999
Note 3
Northing 9999
LAT/LONG Latitude N 84
00.0”
S 80
00.0”
Longitude E/W
180
00.0”
SPH/VAR Spheroid Note 1 Variation
Note 4
E/W 180

NOTES:
1. See table 3-3-3 for spheroid data codes and covered areas.
2. Numeric: 01-60.
Alpha: C-X, except I and O.
3. Typical 100 km Designator:
Column Designator: A-Z, except I and O.
Row Designator: A–V, except I and O.
4. Variation displayed is for destination indicated by DESP DISP thumbwheel.
b. MODE selector — TEST. After about 15 seconds,
left display should display GO. Ignore the random display
of alpha and numeric characters which occurs during the
first 15 seconds. Also ignore test velocity and angle data
displayed after the display has frozen. After about 15
seconds, one of the following five displays will be observed
in the first two character positions in the left display.
NOTE
If the MAL lamp lights during any mode of
operation except LAMP TEST, the computerdisplay
unit MODE switch should be set to
OFF, and then to TEST, to verify the failure. If
the MAL lamp remains on at TEST, notify
maintenance.
If the TEST mode display is MN or NG, the MODE switch
should be recycled through OFF to verify that the failure
is not a momentary one. If the TEST mode display is MN,
the data entry may be made in the UTM or LAT/LONG
mode, but any navigation must be carried on with the
system in the BACKUP mode.
DISPLAY
LEFT RIGHT REMARKS
GO Display
blanks
System is operating satisfactorily.
GO P If right display is P, then pitch
or roll data is missing or in error.
In this case, pitch and roll
in the computer are both set
to zero and navigation is degraded.
Problem may be in
the vertical gyroscope or helicopter
wing.
BU C, R, S,
or H followed
by a numeric
code
A failure has occurred and the
system has automatically
switched to a BACKUP mode
of operation using last remembered
velocities for navigation.
The operator can, as
TM 1-1520-240-10
3-3-10
DISPLAY
LEFT RIGHT REMARKS
an option, enter his best estimate
of ground speed and
track angle.
MN C, R, S,
or H followed
by a numeric
code
A failure occurred and the
BACKUP mode used for
manual navigation (MN) is the
only means of valid navigation.
The operator may use
the computer as a dead reckoning
devise by entering
ground speed and track data.
The operator should update
present position as soon as
possible, because it is possible
significant navigation errors
may have accumulated.
NG C, R, S,
or H followed
by a numeric
code
A failure has occurred in the
system and the operator
should not use the system.
EN The 9V battery has failed. The
system will still operate but all
stored data will be lost when
set is turned off. Data must be
re-entered.
Random
display
Random
display
A failure occurred and the operator
should not use the system.
3-3-16. Entering Data.
This initial data is inserted before navigating with the
doppler.
a. Spheroid of operation, when using UTM coordinates.
b. UTM or LAT/LONG coordinates of present position.
c. Magnetic Variation (MAG VAR) of present position.
d. Coordinates of desired destination - 0 through 5
and H: (6 through 9 are normally used for target store
locations; but may also be used for destinations.) It is not
necessary to enter all destinations in the same coordinate
　
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