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the link SA display. The lettered symbols and cues on the display are described after the corresponding
letter in the following paragraphs.
a. The following uplinked group 1 discretes may be displayed in this slot:
LND CHK Landing check indicates that SPN-42/SPN-46 control radar communication has
been established. It also cues the pilot to be in the landing configuration with ATC
engaged.
ACL RDY ACL ready indicates that SPN-42/SPN-46 acquisition has occurred and uplinked
longitudinal axis (altitude rate) and lateral axis (roll rate) commands are being
received equal to zero. The ACL RDY indication is also displayed on the HUD.
Receipt of the ACL RDY discrete is one of the onboard prerequisites for ACL
couple.
Figure 24-22. DDI SA ACL Display
A1-F18EA-NFM-000
VII-24-56 ORIGINAL
CMD CNT Command control discrete indicates that the carrier has received a verbal confirmation
from the pilot that FCS is coupled to the ACL longitudinal and lateral
commands, and further indicates to the pilot that longitudinal and lateral commands
are now active.
W/O When this discrete is received the FCS is uncoupled from the uplinked commands.
NOT CMD The not command discrete indicates that label 5 information is invalid. When this
discrete is received the label 5 information is removed from the SA display and the
FCS is uncoupled from the T/C heading command/ACL steering commands.
CHG
CHNL
The change channel discrete indicates that the data link frequency should be
changed.
b. The following ACL mode operational cues may be displayed in this slot.
MODE 1 Indicates that the entire loop is capable and ready for coupling for dual axes ACL
control.
MODE 2 Indicates that the entire loop is not capable of Mode 1 coupled approach but is
capable of Mode 2 manual control approach using uplinked situation steering.
T/C Traffic control cue indicates that the entire loop is capable and ready for couple to
the T/C heading command.
TILT Indicates that the uplinked information is not being updated. When this condition
exists all uplinked information is removed from the displays and the FCS is
uncoupled from the data link commands.
c. The following uplinked group 2 C discretes may be displayed in this slot. These cues are
displayed for 30 seconds after initial receipt, then removed.
10 SEC Indicates that SPN-42/SPN-46 is now adding deck motion compensation to the
longitudinal and lateral axes commands. This discrete is received approximately
12.5 seconds before touchdown.
ADJ A/C Adjacent aircraft cue indicates that another aircraft has been detected in the area
of controlled aircraft.
VOICE Indicates that the pilot is to establish voice contact with control.
d. The following onboard capability cues are displayed in this slot.
ACL 1 Indicates that onboard systems are capable of an ACL or T/C couple to the FCS.
ACL 2 Indicates that onboard systems are not capable of ACL or T/C couple to FCS, but
are capable of displaying uplinked information for a mode 2 manual approach.
ACL N/A Indicates that onboard systems are not capable of using uplinked information and
that a carrier controlled approach (CCA) must be made.
A1-F18EA-NFM-000
VII-24-57 ORIGINAL
TEST Indicates that ACL mode is in test.
e. The UTM FAIL cue is displayed in this slot when valid uplinked UTM 3A and UTM 3B were
not received during automatic test.
f. Command heading is displayed by the double chevron symbol on the outside of the compass
rose.
g. Command airspeed is displayed in this slot.
h. Command altitude is displayed on this slot.
i. Command rate of descent is displayed in this slot.
j. The compass rose is track-up oriented with selectable ranges of 10, 20, 40, 80, 160, and 320 nm.
24.6.1.1.2 HUD ACL Display. Figure 24-23 shows the HUD ACL display information. The lettered
symbols and cues on the HUD are described after the corresponding letter in the following paragraphs.
a. Uplinked command heading is indicated by the command heading steering pointer below the
heading scale.
b. The following cues may be displayed in the command heading slot:
10 SEC Displayed for 30 seconds after receipt and then removed. Also displayed on SA display.
TILT Displayed when communication has been lost with data link control. Also on SA
display.
DATA Displayed for 10 seconds and flashed at a rate of two times per second when new
data is initially displayed on the SA display.
W/O When this discrete is received the FCS is uncoupled from the uplinked commands.
c. The following cues may be displayed in this slot:
ACL RDY Displayed when received via data link and the FCS is not coupled. Also displayed
on SA display.
　
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