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the parking brakei s releasedd uring alignment,t he
INS and SAHRS will go to a SUSPEND ALIGN
state as indicated by the computer message on the
OWN A/C MFD format. Alignment will be resumed
upon application of the parking brake. The numerical
alignment quality displayed will never be lower
than 0.50. Actual INS/SAHRS drift rate is normally
less than 0.50 nm per hour,
10. Advancing the NAV MODE switch to INS will
command the INS to its inertial navigation mode.
If the parking brake is still applied at this time, the
SAHRS will continue aligning.
11, In order to improve INS performance, enhanced
alignment may be obtained by performing the following
procedure.
a. Initiate a standard alignment.
b. Allow alignment to continue until an INS
ALIGN COMPLETE message appears on the
MFD.
c. Without changing the NAV MODE switch position,
taxi the aircraft to a convenient location,
changing the heading by at least 70”, with 180”
heading change being optimal.
d. Reapply the parking brake and allow the INS
to continue alignment for a minimum of 1
minute (7 to 8 minutes desired).
Note
The latitude and longitude waypoint 1 will
be updated to current aircraft position when
the NAV MODE switch is placed to INS.
20.3.1.2 Stored Heading Concurrent INS/
SAHRS Alignment. Stored heading alignment is
performed when rapid system reaction is operationally
required. Under normal conditions, stored heading
alignment can reduce ground align time by 1 minute.
This procedure requires that a previous reference alignment
be performed and that the aircraft remain stationary
until the subsequent stored heading alignment is
completed.
Perfo’rm a reference alignment by following the normal
ground align procedure in paragraph 20.3.1 .l.
When the INS ALIGN COMPLETE message appears
on the HUD and/or VDI format, return theNAV MODE
switch to OFF. The aircraft heading should now be
stored in the INS and should be available for the next
alignment as long as the aircraft has not been moved.
Note
Selecting the SAHR pushbutton on the
OWN A/C or NAV DATA MFD formats
before the diamond reaches the second tic
mark will inhibit a subsequent stored heading
alignment.
ORIGINAL 20-24
NAVAIR 01.F14AAD-1
1. Repeat steps 1 through 4 for normal ground
alignment.
2. Verify that SHDG is boxed on the OWN A/C MFD
format (Figure 20-14). Do not depress the SHDG
pushbutton.
3. Repeat steps 6 through 9 as in normal ground align
procedure.
20.3.2 Concurrent Carrier Alignment. Carrier
alignment of the INS and the SAHRS requires knowledge
ofthe carrier motion and position. This information
is best provided by the SINS. A stored heading carrier
alignment is also available using SINS inputs, after a
reference alignment has been performed. For SINS
stored carrier alignment, the stored parameter is actually
the aircraft’s spotting angle on the carrier.
In the event that SINS data is unavailable, carrier
alignment can take place by manual entry of ship’s position,
speed, and heading. This procedure is called manual
carrier align. Because of the entry of fixed
parameters, its real values may be changing and extended
alignment time with lesser alignment quality can
be expected for manual carrier alignment.
20.3.2.1 Concurrent SINS RF or Cable Carrier
Alignment. Carrier alignment using SINS data from
the ASW-27C D/L can be implemented by either cable
or RF transmission, depending on whether the SINS
cable from the deck-edge box to the nose wheelwell
connector is plugged in. For either mode of data transmission,
the following alignment procedure is used, after
verifying proper operation of the MCS and MFD.
1. Ensure SAHRSAC/DCcb’s(lA3,1A5,1A6,913)
pulled prior to application of electrical power.
2. DATA LINK power switch - ON.
3. DATA LINK MODE switch - CAINSWPT.
4. Verify parking brake is set.
Note
Application of SAHRS power prior to selecting
CV ALIGN will not allow SAHRS to
properly align,
5. NAV MODE switch - CV ALIGN.
6. Reset SAHRS cb’s.
7. Select OWN A/C MFD format by depressing
DATA pushbutton on MFD MENU1 display.
The CV SINS DATA format will appear (Figure
20-15).
8. Verify that SHDG is not boxed. If it is, depress
the SHDG pushbutton to unbox it.
9. Monitor the progress of alignment by observing
the QUAL and TIME acronyms and the align scale
on the MFD OWN A/C format. The SINS (ship’s)
latitude, longitude, and INS north and east velocities
　
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