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FOR SIMULATION PURPOSES ONLY
Compass Card
When responding to input from the slaved directional gyro, this card rotates
within the display so that the aircraft heading is always under the lubber line.
Selected Course Pointer
This is a 2 part arrow, the head indicating the desired VOR or localizer course
and the tail indicating the reciprocal. Rotating the course select knob sets
the pointer.
VOR/Localizer Deviation Bar
When the aircraft is on the desired VOR radial, localizer or DGPS course, this
bar forms the centre section of the Selected Course Pointer.
When off course it will be displaced to one side. Since the entire
VOR/localizer display rotates with the compass card, the angular relationship
between the deviation bar and the symbolic aircraft provides a pictorial,
symbolic display of the aircraft’s position relative to the selected course.
Each dot on the deviation scale represents 2° of deviation left or right of the
selected VOR or DGPS course. When tuned to an ILS frequency the deviation
is ½ ° per dot.
Heading Select Bug
This movable marker on the perimeter of the display is used to mark the
desired heading. It is set by rotating the heading select knob.
To-From Indicator
This is a white triangle near the centre of the display that indicates, with
reference to the course set on the select course pointer, whether the aircraft
is flying to or from the selected VOR station.
Glideslope Pointers
Glideslope pointers move up/down against a linear vertical scale on each
side of the HSI; the pointers come into view only when both a satisfactory
signal (UHF) is received and the aircraft is close to the plane of the glide path.
During an ILS approach these indicators represent the vertical orientation of
the glideslope with respect to the aircraft. A pointer high on the scale
represents a glide path above the aircraft and a low pointer represents a
glide path below the aircraft.