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usedf or manual instrumentl anding approacheso r as an
independent monitor during final approach with the
ACLS. TheAN/ARA-63 decoderpanel(Figure 17-3) is
located on the pilot right-side outboard console.
The aircraft system receives and decodes glideslope
azimuth and elevation signals that are converted into
command fly-to indications in the ClU and displayed
via VDI and/or HUD in the TLN mode (Figure 17-2). If
the ILS or ACL landing submodes selected on the pilot
display control panel becomes invalid, the invalid submode
symbology will be removed. A computer message
informing the aircrew which submode became invalid
will be posted on MFD No. 1 and No. 3. As a backup to
the display subsystem, ILS steering indications am also
displayed directly on the pilot standby attitude indicator
vertical and horizontal needles.
Note
The ILS has a minimum warmup time of 1
minute. During this time, a failure indication
should be disregarded.
The ILS performs a self-test when the BIT pushbutton
on AN/ARA-63 decoder panel is depressed and
held. Responseto the ILS self-testi s displayed,p roviding
ILS or BOTH is selected on HUD and MFD. The
correct ILS landing mode display on the HUD and MI
display during system checkout shows the vertical pmcision
course vector symbol slowly oscillating on the
right side of the display, then on the left side. The horizontal
precision course vector symbol remains stationary
in the center of the display.
17-5 ORIGINAL
NAVAIR 0%Fl4AAD-1
L
(AT)&F50D-343-0
NOMENCIATURE ! FUNCTION
HUD Symbology -TLN Gear Up Basic Format
0 Command Heading
Marker
indicates ACL data link final bearing. Where final bearing is beyond display
scale limits the marker will be pegged at the edge nearest to the final
bearing.
0
ILS Precision Course
Vectors
Consists of two independent vectors (vertical and horizontal) that form a
cross pointer. The horizontal vector responds to ILS glide slope error and
the vertical vector responds to ILS localizer error. Null/center indications
are provided to enable the pilot to null the error and keep the vertical and
horizontal needles centered.
Provides ACL Steering commands driven by the SPN-42 data link.
0
ACLS Tadpole
@
Waveoff
@ g~;yg”dding Indicates the selection of AWL Steering.
@ Tacan Range Indicates distance to the tacan station.
A large “x” will appear flashing in the center of the display to indicate a
waveoff.
Figure 17-2. ACLWLS Steering (Sheet 1 of 3)
17-6
NAVAIR 0%F14AAD-1
NOMENCLATURE I FUNCTION
0 Command Heading
Marker
0
ILS Precision Course
Vector
0 ACL Steering Indicator
@
Waveoff
VDI Symbology -AWL Steering Mode
Positioned relative to the magnetic heading scale to indicate ACL data link
final bearing. Where final bearing is beyond display scale limits, the marker
will be pegged at the edge nears& to the final bearing.
Consists of two independent vectors (vertical and horizontal) that form a
cross pointer. The horizontal vector responds to ILS glide slops error and
the vertical vector responds to ILS localizer error. Null/center indications
are provided to enable the pilot to null the error and keep the vertical and
horizontal needles centered.
Provides ACL Steering commands driven by the SPN-42 data link.
During carrier landings, a large “x” will appear flashing in the center of the
display to indicate a waveoff.
Figure 17-2. ACLSiILS Steering (Sheet 2 of 3)
17-7 ORIGINAL
NAVAIR gl-F14AAD-I
NOMENCLATURE
@ Flight Director
FUNCTION
The flight director symbol provides glide slope and centerline steering
information computed by the mission computer using navigation system
parameters and Data Link information from the SPN-42/46 ACLS system.
The flight director provides the pilot with optimal glide path intercept and
following when the flight path marker is inside the flight director box and
the three dots are aligned with the wings and the tail of the flight path
marker. The same procedures are used whether the flight path marker is
caged or uncaged. The flight director symbol is removed from the HUD
when the FLT DIR pushbutton on the VDI is unboxed. The pushbutton is
removed from the VDI if the Flight director is not available for display (for
example, a/c vector or ACL data link mode is not selected).
Permits option to display AWL (both ACL and ILS), ACL, ILS or NO
STEERING information on the MFD. Initial selection of the AWL steering
mode on the basic VDI format displays both ACL and ILS steering
　
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