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waypoint/OAP. The MC enters the waypoint/OAP as the aircraft present position and the MPCD top
level display is returned. The next waypoint in succession becomes designated or, in the case of an
OAP, the offset becomes designated. There is no ACPT/REJ display in the AUTO update mode.
24.2.11 NAV/TAC Bank Limit Options. Bank angle control 1 (BAC1) is engaged when any coupled
steering mode is engaged. BAC1 provides aircraft steering commands and limits; and maintains the
aircraft on course to the selected waypoint(s), offset aim point(s), or TACAN station. BAC1 also
provides steering to capture and hold a course line through the current WYPT, OAP, or TACAN
station. The maximum bank limit (BLIM) is selectable on the A/C data display. TAC BLIM is used for
tactical missions and limits the bank angle between ±30° and ±60° with a bank rate between 10° and
30° per second based on airspeed. NAV BLIM is used for general navigation and sets bank angle to a
fixed ±30° limit with a maximum bank angle rate of 10° per second.
24.2.12 Steering. Types of waypoint/OAP steering described include direct great circle, course line,
auto sequential, and target.
24.2.12.1 Waypoint/OAP Direct Great Circle Steering. Direct great circle steering is available in all
master modes and is selected/deselected by actuating the WYPT/OAP option on the MPCD. Selecting
waypoint/OAP steering deselects ILS, D/L, and TACAN steering. When steering is selected, the option
is boxed and direct great circle steering is provided on the HUD as shown in figure 24-11. To follow a
direct great circle path to the waypoint/OAP, the aircraft is turned so that the command heading
steering pointer under the heading scale is centered in the heading caret. The steering provided by the
steering pointer is corrected for wind drift. When the steering pointer is within ±5° of the caret as
measured on the heading scale, it provides a direct indication of steering error. Between ±5° and the
ends of the heading scale (±15°), the steering pointer moves nonlinearly so that it is at the end of the
heading scale when the steering error is 30°. The steering pointer is displayed at the end of the heading
scale when the steering error is greater than 30°, the steering pointer begins to move to provide
anticipation for rolling out of the turn, and the actual steering error is indicated when within 5°.
Waypoint/OAP range, identification, and number are displayed on the lower right side of the HUD.
On the MPCD, the position of the waypoint/OAP is indicated by the waypoint/OAP symbol as
shown on figure 24-10. If the selected steer to point is an OAP, the position of the offset is indicated
by the offset symbol. Bearing to the waypoint/OAP is indicated by the pointer inside the compass rose.
The waypoint/OAP symbol and pointer are displayed whether or not direct great circle steering is
selected. They provide a navigation situation display only. Steering (corrected for drift) is provided
only on the HUD. A digital readout of bearing and range to the waypoint/OAP is provided on the upper
A1-F18EA-NFM-000
VII-24-35 ORIGINAL
Figure 24-11. Waypoint/OAP Direct Great Circle Steering
A1-F18EA-NFM-000
VII-24-36 ORIGINAL
Figure 24-12. Waypoint/OAP Course Line Steering (Sheet 1 of 2)
A1-F18EA-NFM-000
VII-24-37 ORIGINAL
right corner of the MPCD. Time to go to the waypoint/OAP in minutes and seconds, based on range
and groundspeed, is provided under the bearing and range readout.
24.2.12.2 Waypoint/OAP Course Line Steering. Course line steering is used when it is desired to fly
a selected course to the waypoint/OAP. Course line steering is selected by selecting direct great circle
steering and actuating the course select switch. When the course select switch is actuated, the course
line appears through the waypoint/OAP symbol as shown in figure 24-12, sheet 1. The course line
rotates clockwise while the course select switch is held to the right and counterclockwise while it is held
to the left. A digital readout of the selected course is provided in the lower right corner of the MPCD.
When the waypoint/OAP symbol is beyond the range of the selected MPCD scale, the waypoint/OAP
symbol is limited at the inside of the compass rose coincident with the head of the pointer and the
course line rotates about the head of the pointer. It does not then overfly its correct position on the
map; but, does correctly indicate to which side of the aircraft the course lies, and the intercept angle
is correctly represented.
When a course line is selected, steering on the HUD is displayed. The arrow provides a horizontal
situation indication relative to the velocity vector. As shown, the aircraft is to the right of the selected
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本文链接地址：
NATOPS Flight Manual 飞行手册 2(103)
