BendixKing KFC 500 - Manual (Page 31)

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The EHI 40 Electronic Horizontal
Situation Indicator has capabilites far
superior to any electromechanical HSI
currently available. Because the EHI
40 is so broad in its capabilities, this
section will only attempt to describe
the EHI 40 features that apply to the
KFC 500 Flight Control System. For
additional information on the EHI 40,
please refer to the EFS 40/50 Pilot’s
Guide.
Compass Card — Displays magnetic
heading information received from the
aircraft’s
compass system.
Increments of the compass card are
five degrees.
Course Pointer — Displays the
magnetic course selected with the
course selector knob of the EFS
control panel. The selected course is
displayed numerically in the upper left
corner of the display.
Course Deviation Indicator —
Indicates the aircraft deviation from the
selected course with reference to the
course deviation scale. If the Nav
source is flagged, the D-bar is
removed and a red "X" is
annunciated.
Course Deviation Scale —
Measures the displacement of the
course deviation indicator in relation to
a two-dot scale right and left of course
centerline. The scale calibrations
differ depending on the selected
sensor. In VOR, full CDI deflection
indicates an angular displacement of
10° from the selected course. Full-
scale RNAV deflection indicates a five
mile linear displacement. Localizer full
scale deflection is 2.5° from centerline,
while RNAV approach indicates1.25
mile linear displacement.
Selected Primary Nav Sensor —
The selected primary NAV sensor will
be annunciated just below the center
of display on the opposite side from
which the vertical deviation scale is
displayed.
Vertical Scale Pointer/Vertical
Deviation Scale
— Indicates
deviation from the beam centerline
during an ILS or MLS approach.
Lubber Line — Index mark for
current aircraft magnetic heading.
Nav Flag — Warns that the received
navigation signal is inadequate for
course tracking. The invalid NAV is
annunciated by removing the D-bar
and displaying a red "X".
To/From Indicator Flag — Indicates
the direction of nav reference relative
to the selected course. The To/From
flag is removed when the Nav signal
is invalid.
Symbolic Aircraft — The stationary
symbol is for display reference.
Heading Bug — Indicates selected
heading for flight director tracking in
the Heading mode, as selected with
the heading selector knob on the EFS
controller. Except during selection, the
heading bug remains stationary with
respect to the compass card.
Selected Heading is displayed in
orange in the lower right area of the
EHSI.
EHI 40 Electronic Horizontal Situation Indicator