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aircraft on the desired course. An OVFLY( ) option is available on the WYPT data option display.
When this option is selected (boxed), the aircraft overflies the current WYPT/OAP in the sequence
before intercepting the course of the next one. When OVFLY( ) is not selected, the aircraft performs
a lead turn to intercept the course of the next WYPT/OAP just prior to reaching the current point.
Once the aircraft reaches the last point in the sequence, auto sequential steering uncouples, reverting
to HDG hold in the roll axis. RALT or BALT, whichever is selected, remains engaged when the aircraft
passes the final point. If auto sequential steering does not engage or disengages without being
commanded, an AUTOPILOT caution is displayed on the DDI, and CPL SEQ( ) flashes for 10 seconds
on the HUD and HSI displays. The caution can be cleared with the paddle switch.
Coupled AUTO sequential steering is selected and deactivated as described above in the Auto
Sequential Steering paragraph.
Coupled auto sequential steering is disengaged if UPDT/DSG is selected to perform an overfly
designation. The automatic transition to the next waypoint does not take place. When auto disengage
from coupled steering occurs, autopilot cautions occur. Coupled steering is not automatically reengaged
after the update is complete.
24.2.12.6 Groundspeed Cuing. Before groundspeed cuing is available for display, certain criteria
must be meant: a waypoint/OAP sequence must be entered, a target waypoint/OAP in the sequence
must be selected, time of day must be entered (ZTOD or LTOD), and TOT must be entered. With
waypoint/OAP great circle steering engaged to the target waypoint/OAP, the MC calculates the
groundspeed required to arrive at the target based on a direct path to the target and the entered TOT.
With AUTO sequential engaged, the MC calculates the groundspeed required to arrive at target
waypoint/OAP taking the sequential path to the target. The MC calculates the necessary groundspeed
based on the pilot entered groundspeed, providing there is enough time to travel the final leg at the
entered groundspeed and arrive at the target at the TOT. If there is not enough time to travel the final
leg at the pilot entered groundspeed, the MC ignores the pilot entered groundspeed and calculates a
groundspeed to arrive at the target on time.
NOTE
· Programming a required groundspeed is not necessary for groundspeed
cuing calculations.
· The designated target waypoint/OAP must be in the waypoint/OAP
sequence in order for the required groundspeed cueing function to
operate.
If the target is an OAP the groundspeed required calculation includes the distance from the OAP to
the offset. If the target is NAV designated the MC uses the NAV designation location in the calculation
of groundspeed required for TOT. When the target waypoint/OAP is NAV designated, any other
designation means may be used to adjust the designation and the groundspeed calculation is calculated
to the adjusted designation.
HUD cuing of required groundspeed consists of a tick mark and arrow head located under the
airspeed box. The arrow head is referenced to the tick mark and indicates if the aircraft is traveling too
fast or too slow to reach the target on time. The arrow head is displayed to the left of the tick mark
when the aircraft is traveling too slow and to the right of the tick mark when the aircraft is traveling
too fast. Full displacement of the arrow head left or right of the tick mark indicates a difference of 30
knots between actual and required groundspeed. The aircraft is traveling the correct speed when the
A1-F18EA-NFM-000
VII-24-40 ORIGINAL
Figure 24-13. AUTO Sequential Steering
A1-F18EA-NFM-000
VII-24-41 ORIGINAL
arrow head is centered on the tick mark. The required groundspeed readout is displayed on the MPCD
under the present ground speed readout. See figure 24-13 for an example of HUD and MPCD
groundspeed cuing.
24.2.13 Designation. Designation of a waypoint/OAP is the action by which the pilot identifies a
waypoint/OAP position to the MC so that position can be used for sensor slaving, steering, or position
updating. Navigation and overfly designations are discussed here but sensor designations are described
in A1-F18EA-TAC-Series. Designating a waypoint/OAP initiates the following changes on the MPCD:
the NAVDSG option is removed/replaced with the O/S option, WYPT/OAP is replaced with a boxed
TGT/OAP legend, the waypoint symbol is replaced with the target diamond, the waypoint symbol
inside the waypoint steering pointer is also replaced with the target diamond and the steering
information in the upper right corner now relates to the target. Designating a waypoint/OAP also
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NATOPS Flight Manual 飞行手册 2(105)
