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time (e.g. more than10 minutes) over land or rough water,
then a malfunction may exist in the navigation set and
the operator should set the MODE switch to TEST to
determine the nature of failure.
(4) The display portion of the CDU is tested by
illuminating all the lamp segments in each alphanumeric
characters in the LAMP TEST mode.
(5) Keyboard operation is verified by observing
the alphanumeric characters as the keyboard is exercised.
3-3-47. Route Sequencing Modes.
The system has the ability to fly a preprogrammed sequence
of waypoints. This sequence can be either consecutively
numbered in which case a start and end waypoint
are entered or randomly numbered in which case
TM 1-1520-240-10
3-3-21
all waypoints are put in a list and the start and end waypoints
are entered. Both sequence modes can be flown
in the order they are in the list or in reverse order. Directions
will be displayed to the waypoint next on the list until
approximately 10 seconds before overflying the waypoint
at which time the display will advance to the next
waypoint and the new waypoint number will blink for ten
seconds. One consecutive and one random sequence
may be stored in the system.
3-3-48. To-To Route Mode.
The system has the ability to provide steering information
onto a course defined by the start and end waypoints.
Only the second waypoint will be overflown. The distance
displayed is the distance to the course when outside 2
nautical miles of the course and the distance to the second
waypoint when inside 2 nautical miles of the course.
3-3-49. General Operating Procedures for Entering
Data.
The panel display consists of four line LCD readout. The
top line of the display is reserved for the display of Fly-Todestination
number and destination name/International
Civil Aeronautic Organization (ICAO) identifier, EPE in
meters, mode of GPS and mode of AN/ASN-128B operation
and target store number. The remaining lines will
display data in accordance with the DISPLAY and MODE
switches. When depressing the KYBD key for the first
time in an entry procedure, the display freezes, kybd is
displayed in the bottom right corner indicating the display
is in the keyboard mode and the input field under keyboard
control blinks. If it is not desired to change the
display field under control, the pilot can advance to the
next field of the display by depressing the KYBD key
again. Depressing ENT key (whether or not new data has
been entered) causes the display to blank momentarily
and return with the latest computed data. To abort a
keyboard operation, move the mode or display switch to
another position.
NOTE
All keys activate upon release after being depressed.
Keys should be depressed and immediately
released in one continuous motion.
a. Data Entry. 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. For example, to enter an L, first depress The LTR
RIGHT key, then depress the 4 key.
b. Keyboard Correction Capability. The last character
entered may be cleared by depressing the CLR key.
If the CLR key is depressed twice in succession, the field
is cleared but remains under control (indicated by blinking)
and the last valid data entered is displayed.
c. Destination Variation Constraint. The magnetic
variation associated with a destination must be entered
AFTER the coordinates for that destination are entered.
The order of entry for present position is irrelevant.
d. Impossibility of Entering Unacceptable Data. In
most cases the computer program will reject unacceptable
data (for example, a MGRS area W1 does not exists
and will be rejected). If the operator attempts to insert
unacceptable data, the unacceptable data will be displayed
on the panel and then the selected field will blink
after ENT key is pressed displaying the last valid data.
NOTE
The computer cannot prevent insertion of erroneous
data resulting, for example, from human
or map errors.
e. Procedure for Displaying Wind Speed and Direction.
NOTE
In MGRS mode, wind speed is displayed in
km/hr; in LAT/LONG mode, wind speed is displayed
in knots. Wind direction is defined as
the direction from which the wind originates.
(1) Set MODE switch to LAT/LONG (MGRS
may also be used).
(2) Set DISPLAY switch to WIND–UTC/DATA
and observe display.
(3) The display indicates:
SP;XXXKn
DIR:XXX

f. Procedure for Displaying/Entering UTC and Displaying
　
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