DISPLAY
OVERVIEW
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SANDEL SN3500 EHSI PILOT’S GUIDE
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Heading bug [white]:
This can be set to a desired
heading by rotating the Heading Select knob (right knob).
Pressing the Heading Select knob will SYNC the heading bug with
the lubber line, allowing the pilot to immediately set the heading bug
to the current heading.
Parked heading bug:
When the display is in
the 70-degree ARC mode using the [VUE]
button, it is possible for the heading bug to be
positioned off of the screen. When this happens,
the heading bug “parks” at the side of the screen
nearest to its actual position, with the symbol
displayed smaller than normal and close to the
edge of the screen.
Course pointer:
By rotating the Course Select knob (left
knob), you can set the course pointer to the desired course to
a VOR NAV source. When a long-range NAV source is
selected, the course pointer can automatically rotate to the desired
track being sent by the NAV source (i.e. “Auto-slew”). A unique
course pointer setting is maintained for each NAV source selection.
Parked course pointer
: When the display is in
the 70-degree ARC mode, it is possible for the
head of the course pointer to be positioned off of
the screen. When this happens, the course
pointer “parks” at the side of the screen nearest
to its actual position, with the symbol displayed
smaller than normal and close to the edge of the
screen.
Bearing pointers 1 and 2
: Two bearing pointers are
`provided. Bearing pointer 1 (BRG1) is represented
by the closed tip arrowhead symbol. Bearing pointer 2 (BRG2) is
represented by the open tip arrowhead symbol. Depending on the
user-selected settings, these pointers may show the bearing to a
VOR, ADF, or GPS waypoint. The numeric information from the
instruments assigned to these pointers is displayed in the lower
display area. The information is displayed in the same color as the
associated bearing pointer. Also note that the tail of each pointer
can be used to determine the bearing from the selected NAV
source.
DISPLAY
OVERVIEW
82005-PG-D
SANDEL SN3500 EHSI PILOT’S GUIDE
PAGE
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Inner Course and Vertical Deviation Indicators:
The course
deviation indicator bar (CDI; also known as the deviation bar or “D-
bar”) is the movable center section of the course pointer that depicts
deviation to the left or right of course. The vertical deviation
indicator bar (VDI) is the movable center section that depicts vertical
deviation above or below glideslope or GPS final approach path.
The VDI is only available when tuned to a
glideslope or a vertical deviation from the
GPS. Note that the inner CDI and VDI
are not visible when the map display is
enabled.
Outer Course and Vertical Deviation
Indicator:
The CDI and VDI are also
repeated at the bottom and right side of
the display – this is referred to as the outer
CDI and outer VDI.
Back course
: When flying a back
course approach, the course pointer
should be set to the published front course.
The CDI will automatically reverse sense
when the course pointer is more than +/- 90
degrees from the lubber line. The label “BC”
will appear above the CDI and a yellow “X” will
block the outer VDI during a back course
approach as a reminder to the pilot as shown
in the adjacent figure.
Inner CDI
Inner VDI
Outer CDI
Outer VDI
