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a magnetic-referencedp arameter.A ttitude information
is derived Ram the SAHRS using fmt-order leveling
and, like the SLV mode, is subject to dynamic errors.
The SAHRS EC submode provides only magnetic
heading outputs using the magnetic azimuth detector as
the input source. It is not a navigation mode, and only
magnetich eadinga nd certain air datap arametersw ill be
available when it is selected.
20.3.5.3.3 SAHRS In-Flight Restart If the SAX-IRS
is operating in a degraded submode, it may be possible
to revert to the normal mode of operation via an in-Sight
restart. Prior to attempting an m-flight restart, the selection
of SYS ast he SAT-IRSv elocity referenceis recommended.
In addition, aircraft position data should be
evaluated and a position update should be performed if
large position errors exist. An in-flight restart may now
be initiated by selecting NORM as the SAHRS mode by
depressing the indicated pushbutton on the lower left
portion of the NAV SYS AID MFD format; or by do
pressing the RST pushbutton on the right center of the
sameM FD format (Figure 20-26).T he subsequenbt oxing
of the NORM legend in the SAHR MODE selector
box on this format indicates a reinitialimtion of the
SAHRS to its normal mode. The data to which the
SAHRS is reinitialized is the cutrent value of the navigation
system position and velocity.
20-41 ORIGINAL
NAVAIR 01.F14AAD-1
SAHRS BACKUP SLAVED MODE SELECTED
NAV SYSTEM AIDSAHRS
BACKUP DG MODE SELECTED
NAV SYSTEM AIDFigure
20-27. SAHRS Backup SLV and DG Modes (Sheet 1 of 2)
ORIGINAL 20-42
NAVAIR 01-F14AAD-1
DEU DG HEADING ENTRY FORMAT
(AT)1-FSOD437-2L
Figure 20-27. SAHRS Backup SLV and DG Modes (Sheet 2 of 2)
It is also possible to perform an in-flight restart 6om
the SAHRS normal mode. This should be done only if
serious SAHRS degradation is suspected.
20.3.6 Tactical Navigation. The following paragraphs
describe the procedures to be used for tactical
navigation. This includes range, bearing, and time to go
to waypoints and tacan stations; position updating; continuous
position updating; surface waypoint determinationposition;
display steering modes; autopilot steering;
and all-weather landing.
20.3.6.1 Range, Bearing, and Time To Go to
Waypoints and Tacan Stations. The range, magnetic
bearing, and time to go to any valid selected waypoint
as well as the waypoint number itselfare provided
in alphanumerics on the upper left portion of the MFD
HSD format (Figure 20-28). The desired waypoint
1 number (1 to 100) is selected via the increase and decrease
pushbuttons shown on the left side of the HSD
format. Pressing the upper left WPT pushbutton will
result in the boxing of the above data and entry into
1 destination steering mode.
Range, magnetic bearing, and time-to-go information
to a receiving/transmitting tacan station, also in alphanumerics,
are provided on the same MFD HSD format but
on the upper right-hand side. Included with this data is
the tacan channel number. Depressing the upper right
pushbutton on the MPD HSD format will cause this data
to be boxed and will result in the selected course symbol
being displayed through the tacan symbol, as shown in
Figure 20-28. This will also unbox the waypoint data on
the upper left of the HSD format.
Steering to a selected waypoint (destination steering),
or to a tacan station (tacan steering), using the MFD
HSD format is described in paragraph 20.3.6.5.
20.3.6.2 Update. All updates, except JTIDS, determine
aircraft position one time by computing its location
with respect to a known waypoint. JTIDS updates use
the navigation correction data computed by the JTIDS.
The difference in the computed position and the navigation
system’s present position arc displayed on the MFD
or the DD as differences (deltas) in latitude and longitude.
If these differences are reasonable,t he operator
may elect to update the navigation system, including the
INS and the SAHRS, by depressing the MFD FIX ENABLE
pushbutton.
20-43
NAVAIR 014=14AAD-I
WAYPOINT DATA BOXED
TACANDATABOXED
Figure 20-28. Display of Waypoint and Tacan Data
ORIGINAL 20-44
A navigation update is performed by calling up the
INS UPDATE MFD format shown in Figure 20-29 that
will appearw hen the UPDT pushbuttoni s depressedo n
the HSD basic MFD format, shown in Figure 20-30. The
available types ofupdates consist of visual, tacan, radar,
HUD/designate, data link, and JTIDS. If a particular
update type is not available, an “X” will appear over the
　
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