Horizontal Situation Indicator (Hsi); Aircraft Symbol; Heading Display; Heading Mag/Tru Annunciations - Honeywell SPZ-8000 Maintenance Manual

2. c. (4) Horizontal Situation Indicator (HSI)
(a) Aircraft Symbol - The white aircraft symbol provides a quick
visual cue as to the actual aircraft position in relation to
heading, selected heading, or selected course.
(b)
Heading Display - The displayed compass rose consists of a
180-degree arc that is divided into 5-degree increments and
labeled every 30 degrees. The compass rose rotates about the
stationary aircraft symbol to provide actual heading
information. The compass indices and labels are displayed in
white.
(c) Heading Source Annunciation - Displayed heading comes from the
selected IRS.
(d) Heading MAG/TRU Annunciations - The MAG/TRU reference label is
not displayed if the selected source is the normal on-side MAG
condition. For on-side true data a white TRU is displayed
above the lubberline. Cross-side data is displayed in white as
MAG or TRU with a side designator 1, 2, or 3 attached (Figure
203). When the pilot's and copilot's source are the same, they
are annunciated on both displays in amber.
(e) Heading Bug with Readout - The notched magenta heading bug is
positioned around the rotating heading dial by the heading
select knob located on the flight guidance controller. A
digital heading select readout of bug position is provided and
located at the lower left-hand side of the compass. This data
is labeled with a white HDG. The digital readout is displayed
in magenta corresponding to the heading bug
color. The center
of the heading select knob contains a button labeled SYNC.
Selection of the SYNC button causes the heading bug to align
with the current aircraft heading.
(f) Course Deviation, Course Pointer with Readout - The course
deviation bar represents the centerline of the selected
navigation or localizer course. The aircraft symbol
pictorially shows aircraft position in relation to the
displayed deviation.
The course pointer is positioned around the rotating heading
dial in one of two manners:
Course select knob located on the flight guidance controller
for short range NAV (SRN) sources (i.e., NAV, ILS, MLS).
. Long range NAV (LRN) sources automatically select the
desired track data for the active flight plan (i.e., FMS,
LASERTRAK'").
22-14-00
Page 221
Aug-15/91
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