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CPLD P/R Coupled in pitch and roll is displayed when the FCS is coupled to the longitudinal
and lateral commands. The cue is flashed for 10 seconds at two times per second
then removed if the couple attempt is unsuccessful, or if uncouple occurs for any
reason other than pilot deselection. Disengagement, other than pilot initiated, also
results in an AUTOPILOT caution.
CPLD
HDG
Coupled to heading commands cue is displayed when FCS is coupled in the T/C
mode. This cue is flashed for the same reasons as described for the CPLD P/R cue.
d. The following cues may be displayed in this slot. These cues may be displayed in any master
mode:
A1-F18EA-NFM-000
VII-24-58 ORIGINAL
ATC Displayed when automatic throttle control is engaged. If an unsuccessful engagement
attempt occurs, or if the ATC disengages for any reason other than pilot
deselection, the ATC cue is flashed for 10 seconds at two times per second, then
removed.
NWS Indicates low gain nosewheel steering is engaged.
NWS HI Indicates high gain nosewheel steering is engaged.
e. When ACL mode is initially selected, waypoint steering is automatically deselected, if selected,
and the system is automatically undesignated if an aimpoint is designated. If TACAN is on,
TACAN range is automatically displayed regardless of TACAN steering selection unless the
pilot subsequently designates an aimpoint or selects waypoint steering.
f. The tadpole steering symbol is referenced to the velocity vector and provides uplinked flight
path steering indications for the ACL glide slope and course.
24.6.1.2 ACL Mode Operation. The data link ACL mode is selected by actuating the ACL option
button on the MPCD.
24.6.1.2.1 Initialization. When selected, the ACL legend on the MPCD is boxed and the SA display
is automatically selected on the left DDI. The TEST cue is displayed indicating the ACL mode is in
test. The ICLS, data link, and radar beacon are automatically turned on if not previously on. IBIT is
run on the data link and radar beacon systems. The uplinked UTM is monitored for valid receipt.
When ACL testing is complete the TEST cue is removed, the systems are placed in the correct
operational mode, the stored data link ACL frequency is automatically selected, and the pilot is cued
on the SA display to onboard ACL capability (ACL 1, ACL 2, or ACL N/A) as previously described. If
during test, a valid uplinked UTM message was not received, the UTM FAIL cue is displayed on the
SA display.
Figure 24-23. HUD ACL Display
A1-F18EA-NFM-000
VII-24-59 ORIGINAL
24.6.1.2.2 Traffic Control Couple. When an uplinked label 5 message is received, a determination is
automatically made relative to total loop capability. If the ACL loop is ready for a T/C couple, the T/C
cue appears on the SA display and autopilot options are initialized on the upfront control display with
the CPL option displayed (figure 24-24). The prerequisites for a CPL option for T/C follows:
1. Onboard systems fully operational.
2. Valid label 5 message received.
3. Waveoff (W/O) discrete not received.
4. Uplinked information being updated (no TILT cue).
5. NOT CMD discrete not being received.
6. Label 6 message not being received.
With T/C displayed FCS couple is selected by actuating the CPL option button on the UFCD. When
coupling to the T/C heading command is successful a colon is displayed in front of the CPL option on
the UFCD and the CPLD HDG cue is displayed on the HUD. After couple the FCS banks the aircraft
to a maximum of 30° to capture and hold the uplinked heading command. Aircraft pitch attitude may
be controlled by the pitch hold function of the heading hold mode or by the BALT or RALT altitude
hold modes of the autopilot. A T/C couple precludes use of all other outer loop autopilot modes except
BALT and RALT. The T/C couple disengages, with reversions as noted, for any of the following
reasons:
1. Heading hold mode disengagement with reversion to CAS operation.
2. Roll control stick steering engagement with reversion to lateral axis heading hold mode.
3. Loss of valid uplinked heading command for more than 10 seconds (TILT) with reversion to
lateral axis heading hold mode.
4. Pilot deselection of CPL option with reversion to lateral axis heading hold mode.
5. Pilot actuation of paddle switch with reversion to CAS.
6. Receipt of uplinked W/O discrete with reversion to lateral axis heading hold mode.
7. Receipt of uplinked NOT CMD discrete with reversion to lateral axis heading hold mode.
An unsuccessful T/C couple attempt, or disengagement of the T/C couple for any reason other than
pilot deselection, results in an AUTOPILOT caution as well as CPLD HDG on the HUD flashing for
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NATOPS Flight Manual 飞行手册 2(111)
