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mode may be switched to Y. Observe the
GPS Key status and number of SVs tracked
after switching to Y mode. If the SV number
goes to zero repeat this procedure. The Key
status shall switch from DK IN to DK OK
sometime during the 12 minutes.
(5) Check datum of operation, if MGRS is being
used.
TM 1-1520-240-10
3-3-23
(6) Check destinations in MRGS or LAT/LONG
coordinates as desired.
(7) Check associated destination variations as
desired. Remove all incorrect variations by setting DISPLAY
switch to WP/TGT, setting the destination number
to appropriate destination, and depressing the KYBD key
and ENT key in that order. Variations of at least two
destinations must be entered for automatic variation update
computation to be performed. For accurate navigation
it is advised to enter variation after each destination
unless the variations are the same.
(8) Select DGNS operating mode (para e. below).
NOTE
The set will automatically select combined
mode (default or primary operating mode) as
this allows the system to select the best possible
navigation method available.
(9) Set the FLY-TO DEST to the desired destination
location.
c. Procedure for Downloading Data From Dataloader
Cartridge.
(1) Set the CDU mode switch to OFF.
(2) Insert the preprogrammed data loader cartridge.
(3) Set the CDU mode switch to MGRS (LAT/
LONG may be used). Enter desired GPS code (M or Y)
mode of operation.
(4) Set the DISPLAY switch to WIND-UTC/
DATA.
(5) To display the select menu depress the ENT
key twice.
1>SEA CURRENT
2>SURFACE WIND
3>GPS STATUS
4>DATA LOAD end
(6) To select the DATA LOADER page depress
the 4 key.
DATA LOADER
ENTER DATA:N
end
(7) To begin the download depress the KYBD
and enter Y (yes).
(8) Observe the CDU display. The CDU shall
display DOWNLOAD WAYPTS and WAIT ACK. If a
transmission error occurs the CDU display shall change
to ERROR-RETRYING.
(9) When the transmission is complete the CDU
shall display DOWNLOAD WAYPTS COMPLETE. If this
display is not obtained within one minute of beginning the
download check the data programming and connection.
(10) Set the CDU mode switch to OFF, remove
the data loader cartridge if desired, and then set the CDU
mode switch to desired setting.
d. Self-Test
(1) Set the MODE switch to LAMP TEST. Enter
GPS mode “M” or “Y”. Verify the following:
(a) All LCD on four-line display are illuminated.
(b) The MAL lamp is illuminated.
(2) Rotate the center lighting control. Verify the
following:
(a) All edge lighting is illuminated.
(b) All keyboard keys are illuminated.
(3) Set MODE switch to TEST.
(a) While test is performing, depress the
DIM pushbutton several times, then the BRT pushbutton
several times. The LCD display should glow dimmer then
brighter. Adjust LCD display for comfortable viewing.
(b) After Doppler and/or GPS self test have
completed (approximately 15 seconds for Doppler, up to
2 minutes for GPS), one of the following displays will be
observed in the left and right displays:
NOTE
In the event the TEST mode display is not GO
ALL the system should be recycled through
OFF to verify the failure is to a momentary
one.
TM 1-1520-240-10
3-3-24
LEFT DISPLAY RIGHT DISPLAY REMARKS
GO Doppler has completed Built in Test (BIT) and is operating satisfactorily,
GPS is still performing BIT (GPS has 2 minute BIT cycle maximum).
Note that a rotating bar in the display indicates that the GPS is still performing
self test.
GO ALL The entire system has completed BIT and is operating satisfactorily.
GO P Pitch or Roll data is missing or exceeds 90. In this case, pitch and roll in
the computer are both set to zero and navigation in the Doppler mode
continues with degrade operation. Problem may be in the vertical gyro or
aircraft cabling.
NG C, R, S, or H followed
by a numeric
code
A failure has occurred in the Computer Display Unit or the Signal Data
Converter Power Supply. The operator should not use the system.
DN GPS failure code GPS has failed but operator can use doppler to perform all navigation.
DF Doppler failure
code
Doppler has failed. GPS is still performing self test.
GN Doppler failure
code
Doppler has failed but operator can use GPS to perform all navigation.
e. Procedure for Displaying or Selecting GPS M or Y
Operating Mode, Doppler, GPS, or Combined Operation,
and Displaying Groundspeed and Track.
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