ARC MODE (PARTIAL COMPASS FORMAT)
During operation in the arc mode, 90° of arc presentation is visible on the HSI. Pressing the HSI
button on the display controller toggles the display between the full and partial compass display.
HSI CAUTION OR FAILURE ANNUNCIATIONS
Amber caution annunciations will appear to indicate the following situations:
Range Rings Display of the range rings aids in the use of radar returns when WX mode is
selected. Center half-range ring represents half the value of the selected
radar range. Range is controlled by the weather radar controller. Power up
default is 50 nautical range.
Weather Weather radar returns are displayed on the HSI when WX mode (HSI Button
pressed) is selected on the display controller. WX mode forces the PFD into
arc display if it was not already selected. Radar mode annunciations are
presented on the left side of the HSI presentation and on the lower left side
of the multi-function display (MFD).
DME Hold
When the DME is selected to HOLD, an amber H will appear to the left of the
DME readout on the HSI.
FMS Alert
Messages
Waypoint (WPT), dead reckoning (DR), GPS Integrity (INTG), or Degrade
(DGR) messages appear in amber at the upper center-left of the HSI
presentation to indicate, respectively, that a waypoint is being passed, the
FMS is in dead reckoning, the GPS has an invalid receiver condition, or the
FMS navigation has become degraded for any of various reasons. Amber
MSG annunciated (flashing) in amber at the top center-right of the HSI
display indicates that the FMS has a message on the FMS CDU.
Digital Display
Cautions
When DME, ground speed (GSPD), time-to-go (TTG), or elapsed time (ET),
digital readouts fail, the digital display will be replaced by amber dashes.
Target Alerts
An amber TGT on WX window indicates weather radar target alert. A green
TGT annunciation indicates that target mode has been selected (enabled) on
the weather radar. An amber annunciation means that a level three weather
return has been detected in the forward 15° of the forward antenna scan.
Digital Readouts
Failure of the course or heading select signals will cause these displays to
be replaced by amber dashes. They are also dashed when the heading
display is invalid.
Heading Source
and Navigation
Source
When the pilot and copilot select to the same heading source or NAV source,
the source annunciators will be amber. If the NAV or heading sources are
cross-switched, i.e., pilot to copilot and vice versa, the annunciation will also
be in amber. Normal selections are not annunciated.
Cessna Citation XLS - Instrumentation & Avionics
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