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Alignment, paragraph 20.3.3.2.1. Since this alignment
mode uses system magnetic heading to initialize heading,
the alignment process will be shortened. A SAHRS
ALIGN COMPLETE message should normally occur
within 1 minute, although the navigation quality value at
this time may exceed 10 nm per hour. If time permits,
additionala lignment is recommendeda ndw ill take place
as lone as the ~arkine brake is set. In this mode of alianmerit,
magnetic h&g inputs from the magnetic arim&
detector (flux valve) are used for initializing the SAHRS
heading.I t shouldb es electedo nly in amasw heren o magnetic
interferenceo r anomaliese xist.
20.3.3.2.4 SAHRS Standalone Carrier Allgnment.
The SAHRS standaloneC V alignment mode is
manually selected via the SAHRS ALIGN MFD format
by depressing the SAHR and then CV pushbutton
shown in Figure 20-18. There are two SAHRS standalone
align modes. Which mode obtained depends on
when CV is selected. If CV is selected prior to the INS
determining true heading (approximately MS quality of
5) and initiating the SAHRS CV concurrent align, a
SAHRS standalone align is commanded when the
SAHRS has no heading information.
Note
Currently there is no indication on the MFD
displays that the SAHRS has gone into the
standalonem ode except the SAHRS quality
value will remain 10.0, the timer will be 00,
NAVAIR 0%F14AAD1
SAHRS concurrent CV align will not initiate,
and there will be no attitude information
available from the SAHRS for up to 6 minutes
or more. Reinitiating the INS alignment
will allow a concurrent alignment to occur.
The SAHRS hasn o true standalonec arrier alignm ode
like theI NS. Dming concurrenItN SK4HRS carriera lign
modes, the SAHRS depends on the INS to provide an
initial input of true heading. Since this is not available in
SAHRS standalonec arrier alignment,w hen the SABRS
CV pushbuttonis depresseidn SAHRS standaloneo peration,
it is commanded to a DG mode. Once the parking
brakeisre]easedaWjheadingcanbeenteredviatheDEU.
When the aimaft is airborne, the slaved mode csn be
selectedo r if a systemv elocity sourcei s present,in -flight
restart can be selected to bring the SAHRS to a normal
operational mode. This is described in SAHRS Backup
Modes, paragraph2 0.3.5.3.2.
If CV is selected after the INS has initiated the
SAHRS CV concurrent alignment, the SAHRS align
ment proceedsb ut is no longer receiving updatedp osition
and velocity information from the INS. The
alignment will be considerably slower than concurrent
alignment. The SAHRS is commanded to NORM mode.
An in-flight restart may or may not be required depending
on the SAHRS alignment quality.
WI-IRS cannot be commanded to a CV mode unless
the INS is in CV. If the INS is unavailable, the SAHRS
will attempt a normal ground align.
20.3.4 Initially Entered Navigation Parameters.
Prior to takeoff, either during or after alignment,
it may be desirable to enter certain initial navigationrelatedp
arametersi,n addition to thosen oted abovet hat
are required for alignment. It may also be possible to
enters omeo f thesep arametersa t any time during flight.
They include the following and are discussed below:
1. Day barometric setting
2. Way-point data
3. Wind speed and direction
4. Magnetic variation.
20.3.4.1 Barometric Setting. The barometric setting
is normally made by the pilot using his 2-inch barometric
altimeter setting knob. Although this setting is
normally made prior to takeoff, it can be made anytime
including during flight. The setting range is from 28.10
to 30.99 inches of Hg and the value set should be that
reported by the control tower. This will provide system
2091 ORIGINAL
NAVAIR Ol-F14AAD-1
altitude corrections to within a maximum error of 16
feet. Verify that the entered value is displayed (Figure
20-6) on the HUD. A small difference between the HUD
and instrument values may be expected. This will usually
be less than 0.01 inch of Mercury but may on occasion
be 0.02 inch. If any difference is present, adjust the
altimeter so that the correct control tower value is displayed
on the lower right side of the HUD. Barometric
settings may also be made by the RIO via the DEW. To
do this, the altimeter must be locked out by turning the
setting knob to the minimum value (28.10 in Hg). The
DEU OWN A/C page can now be used to enter the
required value affer depressing the BAR0 pushtile and
the proper numeric values.
Entry of barometric settings can be made on the
ground or in the air.
1 20,.3.4.2 Waypoint Data Entry. Up to 100 waypomts
　
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