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and MFD pushbuttonso n the MFD when in AWL steering,
which provide for separateIL S andA CLS selection
for both the HUD and MFD VDI format. This enables
any mix of ILS (ANN/SPN-41/AN/ARA-63), ACL
(AN/SPN-42/data link), or no displays at the pilot’s
option.
The ILS and ACL displays differ in that the ILS errors
are displayed by needles and the ACL errors are displayed
with the ACL steering indicator. The ACL steering
indicator (Figure 17-2) represents where the
intersection of ACL needles would be ifpresented. Azimuth
and glideslope deviation are representedb y the
relationship of the velocity vector to the needles/ACL
steering indicator. Two different means of displaying
ILS and ACL steering are used to allow the option of
displaying both sources of information simultaneously
on either display (MFD or HUD). Both displays in the
ACL mode display a command heading marker. This
marker, during AN/SPN-42 approachesi,n dicates final
bearing.
The ILS steering displays approach information in
the form of precision course vectors. A vertical vector
is used for azimuth steering while the horizontal vector
is for elevation. The pair form a crosspointer and are
displayed on the HUD and MI presentationss imultaneously.
Full-scale deflection limits of the HUD and
VDI vector symbols are 2’ and 1.5 inches, respectively.
The vectors are limited to this deflection to ensure the
displayed symbol will always have an intersection. Full
scale deflection limits correspond to 6” of lateral deviation
from centerline and 1.4’ of vertical deviation from
glideslope.
The ACL submode uses the ACL steering indicator
that is driven by the data link instead ofthe AN/ARA-63
receiver decoder. Any combination of ILS needles,
ACL steering indicator, or neither is available for the
HUD or VDI presentations. Selection of each is controlled
by the pushbuttons contained on the MFD once
AWL steering is selected.
17-3 ORIGINAL
NAVAIR 01.Fl4AAD-1
NOMENCLATURE
a MODE switch
0 ACLS TEST PUSH
Ilghtlpushbutton
SINGLE - Limits beacon response to single pulse of any code group
received.
DOUBLE - Beacon response set to one of ftve double-pulse
Intenogatlons.
ACLS - Enables augmentor operatlon.
piiiz-WARNINO(
ACLS shall not be selected on the flight deck
when the power switch Is In STBY or PWR, or
during the 5-minute beacon warm up period.
On (green) - Indicates a ANI.SPN-42 lockon In ACLS mode; when pressed
with radar beacon mode selector In ACLS, indicates a
satisfactory self-test of ACLS mode only.
Flashing - Indicates ANISPN-42 Is sweeping through alrcraft but has not
locked on.
lntermlttent
(or no Ilght) - During self-test Indicates a fault In the ACLS mode only.
ORIGINAL
Figure 17-I. Radar Beacon Panel (Sheet 1 of 2)
17-4
NAVAIR 01-F14AAD.1
NOMENCLATURE FUNCTION
0
Power switch PWR - With radar beacon mode selector in ACLS, enables l-band
replies to Ka-band interrogations.
STBY - Used tar warmup with radar beacon MODE switch in SINGLE or
DOUBLE.
Note
The beacon will warm up with the switch in either
posltlon STBY or PWR. To prohibit response to
premature or unintentional Intenogations, warmup
should be accomplished in STBY For optimum
performance allow 5-minute warmup.
OFF - Turns off all power to radar beacon.
Figure 17-l. Radar Beacon Panel (Sheet 2 of 2)
Additionally, certain ACLS commands that are
uplinked to aircraft via the data-link system are displayed
to both aircrew on MFD No. 1 and No. 3.
Note
For more detailed information on the data
link symbology, refer to NAVAIR Ol-
Fl4AAD-IA.
The ACLS and ILS systems provide angular situation
information (ILS needles and ACLS tadpole) of glidepath
errors that requires the pilot to determine the corrections
needed to eliminate those errors, resulting in
higher workload and possible degraded approach performance(
overshootsa ndo scillations).T he flight director
display provides the optimum glidepath steering
information (as computed by the mission computer using
navigation system parameters and data-link information
from the SPN-42/46 ACLS system) to intercept
and follow the glideslope and centerline, which reduces
pilot workload and improves approach performance.
The flight director symbol can be selected for display on
the HUD by boxing the FLT DIR pushbutton on the pilot
AWL VDI MPD format.
17.2.7 Instrument Landing System (ANIARA-63).
The aircraft ILS uses the AN/ARA-63 receiver decoder
to process ANElPN-41 confirmation. This system is
　
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