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course, but is converging toward it. Two dots are displayed on the side of the velocity vector toward the
steering arrow and in a line perpendicular to it. The outermost dot represents full scale deflection of
the arrow (8°) and the innermost dot indicates half scale deflection (4°). If the arrow moves to the other
side of the velocity vector, the dots appear on that side. The dots are not displayed when within
approximately 1.25° of being on course. Figure 24-11, sheet 2 shows an example of the HUD steering
arrow display as the aircraft crosses a course line. The HUD situation arrow display is available only
Figure 24-12. Waypoint/OAP Course Line Steering (Sheet 2 of 2)
A1-F18EA-NFM-000
VII-24-38 ORIGINAL
in NAV master mode, although waypoint/OAP steering can be selected and the course arrow can be
displayed and used on the MPCD in any master mode. Only waypoint/OAP direct great circle steering
is available on the HUD when designated. Course line steering can be deselected either by deselecting
waypoint/OAP direct great circle steering or by selecting a new waypoint/OAP, initializing direct great
circle steering.
24.2.12.3 Coupled Waypoint / OAP Steering. When waypoint steering is coupled, CPL WYPT is
displayed on the HUD and HSI display, and a CPLD advisory appears on the DDI. The aircraft steers
to intercept the desired course line, or flies to the point if no course line is selected. Bank angle is
limited by NAV or TAC bank limit option as selected on the A/C sublevel display and described in
chapter 2. As the aircraft gets close to the desired course, the bank angle is reduced to maintain the
aircraft on the desired course. If course line steering is not selected, when the aircraft reaches the
waypoint or offset aim point (OAP) WYPT steering uncouples and reverts to HDG hold. If course line
steering is selected, the aircraft remains coupled and flies an outbound radial. RALT or BALT,
whichever is selected, remains engaged when the aircraft passes the waypoint. If a ground point is
designated, WYPT steering does not couple, or uncouples if previously coupled. If waypoint steering
does not engage or disengages without being commanded, an AUTOPILOT caution is displayed on the
DDI, and CPL WYPT flashes for 10 seconds on the HUD and HSI displays. The caution can be cleared
with the paddle switch.
24.2.12.4 AUTO Sequential Steering. Before AUTO sequential steering can be selected a waypoint/
OAP sequence must be programmed.
AUTO sequential steering is selected by actuating the AUTO option (AUTO boxed) on the MPCD.
When selected, other steering modes not compatible with AUTO sequential are deselected.
With AUTO sequential steering engaged, great circle steering is provided to the first waypoint/OAP
in the selected sequence, see figure 24-13. When range to the steer to waypoint/OAP is less than 5 NM
and bearing is greater than 90°, the next waypoint/OAP in the sequence is automatically selected.
Great circle steering is automatically provided for each new steer to waypoint/OAP in the sequence.
During AUTO sequential steering course line steering is available but course line is deselected when
the steer to waypoint/OAP is within the range and bearing mentioned above. The waypoint/OAP
up/down arrows provide manual selection for steering to the desired waypoint/OAP in the sequence.
With AUTO sequential steering engaged, selecting the SEQ # option provides dashed lines on the
MPCD connecting the waypoint/OAPs of the chosen sequence.
AUTO sequential steering is deactivated when any of the following occur: the AUTO option
deselected (unboxed), the last waypoint/OAP in the sequence is within the parameters mentioned
above, selection of another steering mode, the FCS is coupled to the D/L, AUTO update is selected, a
ground point is designated, magnetic heading is invalid, aircraft present position is invalid, aircraft
ground track is invalid, or steering waypoint/OAP range/bearing is invalid.
Auto sequential steering is suspended if UPDT/DSG is selected to perform an overfly designation.
The automatic transition to the next waypoint does not take place until the update is either accepted
or rejected and the sequence criteria is satisfied.
24.2.12.5 Coupled Auto Sequential Steering. When auto sequential steering is coupled CPL SEQ
#( ) (current sequence number: 1, 2, or 3 replaces the parenthesis) is displayed on the HUD and HSI
display and a CPLD advisory appears on the DDI. The aircraft steers to intercept the desired course
of the current WYPT/OAP in the sequence. Bank angle is limited by NAV or TAC mode as described
in chapter 2. As the aircraft gets close to the desired course, the bank angle is reduced to maintain the
A1-F18EA-NFM-000
VII-24-39 ORIGINAL
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NATOPS Flight Manual 飞行手册 2(104)
