18-3.3 DOPPLER/GPS NAVIGATION SYSTEM OPERATIONAL CHECK (Continued)
1 8 - 3 . 3
Depress GPS Alert Indicator (7).
Place CDU DISPLAY switch (9) to PP.
Perform the following for downloading of
waypoints from Data Loader Cartridge:
Place CDU (3) MODE switch (4) to OFF
Insert a programmed Data Loader in
Set CDU Mode switch to MGRS.
Make sure Mode of the GPS is in M.
Set CDU Display switch to WIND
Depress ENT twice to display the
Enter 4 to select the data load page.
To begin downloading, depress KYBD
and enter Y (yes).
10. Turn CDU (3) MODE switch (4) to OFF, remove
Data loader cartridge from the receptacle and
turn the MODE switch (4) to MGRS.
Turn CDU (3) DISPLAY switch to (9) DIST/
BRG/TIME and select several waypoints.
12. Depress the GPS/DOP lenses (10) on each of
The SEL indication at the lower half of each GPS/DOP
the two HSI Mode Select Panels (11) (one each
(8) lens shall be illuminated. If SEL not illuminated, go
in pilot and copilot Instrument panels).
to TM 11-1520-240-23.
13. Observe each HSI (12).
The number one needle (13) of each HSI indicator (12)
shall swing to show the bearing to the station with the
course deviation bar (14) centered. The Range (15)
and Course (16) readouts shall also be accurate. If the
number one needle (13) does not swing to show bear-
ing to the station or the Range (15) and Course (16)
readouts are not accurate, go to TM 11-1520-240-23.
GPS Alert Indicator (6) illuminates. If indicator does
not illuminate, go to task 18-3.7.
Present position is displayed. If present position is not
displayed, go to task 18-3.8.
CDU (3) displays DOWNLOAD WAYPTS IN PRO-
CESS and WAIT ACK during waypoint loading and
DOWNLOAD WAYPTS COMPLETE within one minute
to indicate that waypoint loading is complete. If display
is incorrect go to task 18-3.9.
Observe each HSI (12) and four-line display
on the CDU (3).
In the center instrument panel switch GPS
ZEROIZE switch (17) up then down. On the
CDU (3) set DISPLAY switch to DIST/BRG/
TIME and observe the four-line display.
Reperform steps 8, 9 and 10 above.
Perform HAVEQUICK checks on the HF, UHF
and SINCGARS Radio Sets.
Turn CDU (3) MODE switch (4) to OFF.
Stop APU. Refer to task 15-1.4.
The indications on the four-line display and each HSI
are the same. If the indications are not the same, go to
All waypoints have disappeared. If waypoints have not
disappeared, go to task 18-3.11.
This task shows that the system is functional and
ready. If waypoints could not be downloaded, go to
The Radio Sets have HAVEQUICK Timing. If any or all
Radio Sets do not have HAVEQUICK Timing go to
The Doppler/GPS Navigation System is off.
Electrical Power Off
The four-line display will display distance, bearing and
time information for each waypoint. If any four-line dis-
play is incorrect, replace the CDU.
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