TM 1-1510-218-10
3C-32
Figure 3C-11. HSI ARC Format (Off Display CRS, HDG, and Bearing)
(1) Selected HDG Readout. A digital
readout of a selected heading is displayed in the
upper left-hand corner of the display. When the
heading bug is visible, it will appear when the
selected heading is changed and is removed
10 seconds after the heading bug quits moving. If
the heading bug is off the screen, the readout is
constantly displayed.
(2) Course Needle. When the primary
course moves out of view, the primary course needle
and deviation bar size reduce so that the head or tail
is always visible.
(3) Bearing Needle. When the bearing
needle head and tail are outside of the displayable
area, a cyan bearing needle appears on the inside of
the compass within its major tick marks pointing to
where the needle head would be.
h. Map ARC Format (Partial 80°). The Map
ARC format (Heading Up Map, Figure 3C-12) is an
expanded rose format with a compass segment at
the top of the display and the aircraft symbol
centered laterally at the bottom. The ARC Map
provides a display of the active flight plan. Refer to
Figure 3C-13 for a description of the map symbols.
The operation of the peripheral information,
compass rose and annunciations, are the same as
the HSI ARC mode with the following exceptions.
(1) Range Arc. The range knob, concentric
with the mode switch, selects range on the map format.
The static dashed range ring and label consist of one
cyan arc and cyan text representing half the value of the
range setting. The arc is half way between the aircraft
symbol position and the point of the lubber line.
Available full-scale ranges are 2.5, 5, 10, 20, 40, 80,
160, 320, and 640 nm.
(2) Selected HDG Readout. A digital readout
of the selected heading is displayed in the upper left-
hand corner of the display. When the heading bug is
visible, it will appear when the selected heading is
changed and is removed 10 seconds after the heading
bug quits moving.
(3) FMS Waypoints Displayed. The MFD will
display up to 15 FMS waypoints of a flight plan. One
past and 14 future waypoints are located in their proper
rho-theta position with respect to the selected range and
aircraft symbol. The active waypoint is magenta and all
other waypoints are drawn in white. Waypoints are
identified by identifiers next to the waypoint symbol. An
Arc pattern or a holding pattern associated with the
active waypoint (TO) is drawn if the pattern is activated.
If not, an ICON symbol representing the pattern type is
drawn. Pattern ICON's are drawn next to all future
waypoints that have an associated pattern. DME Arcs
are drawn whenever they are present.
