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Figure 20-30. HSD Basic h@D Format
20-49 ORIGINAL
NAVAIR 0%F14AAD-1
20.3.6.2.3 Radar One-Fix Update. Radar one-fix
update computes aircraft position using radar measurements
of range, azimuth, and elevation angles from a
radar-identifiable target whose coordinates are known
and are stored in the waypoint file. This procedure requires
that the radar is operating in the ground-map
mode and that the DD cursor be positioned over the DD
displayed target prior to designating via the sensor hand
control as described below. Like other one-fix update
modes it also requires that the waypoint corresponding
to the radar target coordinates is selected for the update
as described below. Since this procedure requires the use
of the DD control panel, it can be performed only by the
RIO. The procedure is as follows:
1. Select the radar ground-map mode via the GND
MAP pushtile on the DD, shown in Figure 20-3 1.
2. Verify that the coordinateso f the radari dentifiable
point are the same as those of the waypoint to be
selected for updating by calling up the appropriate
WPT DATA MFD format, Figure 20-20. If incorrect,
enter the correct values via the DEU or DD.
3. Call up the INS UPDATE format, Figure 20-29.
Select the correct waypoint corresponding to the
coordinates of the radar-identifiable point via the
increase/decreaspeu shbuttonso n the right side of
the INS UPDATE MFD format.
4. Select half-action mode by depressing the trigger
on the RIO sensor hand control to the first detent
position.
5. Place theDDcursoroverthedisplayedradartarget
on the DD (Figure 20-3 1) using the sensor hand
control and depresst he trigger to the secondd etent
(full action).
6. Depress the RDR pushbutton on the INS UPDATE
MFD format. The RDR legend will become
boxed and the computed delta LAT/delta LONG
will appear as shown in Figure 20-29.
7. If the delta LAT/LONG corrections appear reasonable
and a correction is required, depress the
FIX ENABLE pushtile. The corrections will be
incorporated into the system and the sensors and
the correct latitude and longitude will be displayed
on the OWN A/C MFD format, which
will now appear.
20.3.6.2.4 Data-Link One-Fix Update. Data-link
one-fix update computes aircraft position using inputs
from an externalp latform that measuresth e aimratl position
with respect o an agreedd ata-linkt argetp oint whose
coordinates are stored in a specific location in the waypoint
file. The measured information consists of components
of slant range to the waypoint that are
transmitted to the aircraft via a specific data-link message.
T he procedurer equirest hat the coordinateso f the
agreed data-link target point are stored as waypoint 18
in the waypoint file and that the data link is operating in
the tactical mode. Verification and selection of the waypoint
are performed similar to other one& update procedures
but the tactical situation display on the MFD is
used for location and designation of the data-link target
point (Figure 20-32). Both the pilot and the RIO can
perform this update procedure. The pilot uses the cursor
control switch on the throttle, and the RIO uses the
sensor hand control for designating and positioning the
cursor. The procedure is as follows:
1. Verify data-link operation in the tactical mode
(i.e., DATA LINK MODE switch is in TAC).
2. Verify the coordinates of waypoint 18 are the previously
agreed values by calling up the WPT
DATA 2 MFD format.
3. Call up the INS UPDATE MFD format (Figure
20-29) and select waypoint 18 via the increase/
decreasep ushbuttons.
4. Call up the TSD MFD format (Figure 20-32) available
from the MENU1 MFD format. Using the
pilot cursor control or the RIO sensor hand control,
place the cursor over the data-link target point position
and depress the switch.
Note
Both waypoint 18 from the waypoint file and
the data-link reported location of this point appear
on the TSD format. Since both symbols
representth e samep oint, the differencein their
location on the TSD MFD format is an indication
of the aircraft position error. A check
should be made to ascertain that this error is
reasonablep rior to pertorming the update.
5. Call up again the INS UPDATE MFD format.
Depress the D/L pushbutton. A delay of several
seconds may occur prior to the boxing of the D/L
legend and the appearanceo f the delta LAT and
LONG displays (Figure 20-29).
6. If the errorsa ppearr easonablea nd anu pdatei s desired,
　
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