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coordinates can be entered and displayed in UTM and
latitude/longitude. At the same time, distance, bearing
and time-to-go to any one of ten preset destinations are
computed and displayed as selected by the FLY TO
DEST thumbwheel.
c. Backup Mode In this mode, remembered
velocity data are used for navigation. The operator can
insert ground speed and track angle with the keyboard
and the display in GS-TK position. This remembered
velocity data can be manually updated through use of the
keyboard and CDU DISPLAY selector switch in GS-TK
position. When GS-TK values are inserted under these
conditions, navigation continues using only these values.
3.14.7 Methods of Operation. Methods of operation
are as follows
a Window Display and Keyboard Operation. In
all data displays except UTM coordinates, the two fields
are the left and right display windows. In UTM
coordinates displays, the first field of control is the center
window and the second field is the combination of the left
and right displays. When pressing the KYBD
pushbutton, one or other of the fields described above is
under control. If it is not desired to change the display in
the panel section under control, the pilot can advance to
the next field of the display panel by pressing the KYBD
pushbutton again. The last character entered may be
cleared by pressing the CLR key. That character may be
a symbol or an alphanumeric character. However, if the
CLR key is pressed twice in succession, all characters in
the field under control will be cleared, and that field will
still remain under control.
b. Data Entry. To enter a number, press the
corresponding key. To enter a letter, first press the key
corresponding to the desired letter. Then press a key in
the left, middle, or right column corresponding to the
position of the letter on the pushbutton.For Example: To
enter an L, first press L, then either 3, 6, or 9 in the right
column. The computer program is designed to reject
unacceptable data (for example, a UTM area of WI does
not exist and will be rejected). If the operator attempts to
insert unacceptable data, the display will be blank after
ENT is pressed.
c. Starting Procedure.
(1) Lamp Test
1. MODE selector switch LAMP TEST. All display
segments and indicator lamp should be on.
2 DIM control Turn fully clockwise, then fully
counterclockwise, and return to full clockwise. All
segments of the display should alternately glow bright, go
off, and then glow bright.
(2). Test.
1. MODE selector switch TEST.
NOTE
• 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. A successful test cannot be
accomplished until HARS has completed BIT.
• If the MAL lamp lights during any mode of operation
except LAMP TEST, the CDU MODE switch should be
turned first to OFF and then to TEST to verify the failure.
If the MAL lamp remains on after recycling to TEST,
enter the failure of the DNS on DA Form 2408-13-1 in
the aircraft log book.
• After approximately 15 seconds, one of the following
displays in table 3-13 will be observed in the left and right
displays:
Change 3 3-41
TM 1-1520-238-10
Table 3-13. AN/ASN-128 Window Displays
DISPLAY REMARKS
LEFT RIGHT
GO No display If right display is blank, system is operating satisfactorily.
Display
blank is
(normal).
GO P If right display is P, then pitch or roll data is missing, or pitch exceeds 90 deg. In this case, pitch
and roll in the computer are both set to zero and navigation continues in a degraded operation.
Problem may be in the HARS or helicopter cabling.
NOTE
If the TEST mode display is BU, 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 BU or MN, the data
entry may be made in the UTM or LATT/LONG mode: but any navigation must be carried on
with the system in the BACKUP mode
BU C,R,S, or A failure has occurred and the system has automatically switched to a BACK-UP
H followed mode of operation as follows:
by a
numeric code 1. If no true airspeed is available, last remembered velocity is being used for navigation.
2. The operator has the option of turning the MODE switch to BACKUP and entering the
best estimate of ground speed and track angle.
3. If true airspeed is available, true airspeed plus remembered wind is used for navigation.
NOTE
The operator has the option of turning the MODE switch to BACKUP and entering his best
　
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