Specifications

SECTION III
INSTRUMENTATION AND AVIONICS
MODEL 560
ARC MODE (PARTIAL COMPASS FORMAT)
During operation in the arc (WX) mode, additional presentations are available which enhance
navigation and safety of flight. Pressing the FULL/WX button on the display controller toggles the display
between the full and partial compass display. Selecting Additional features presented in partial display are:
Range Rings - Display of the range rings aids in the use of radar returns when (WX)
mode is selected. Center half-range ring represents the selected radar
range. Range is controlled by the weather radar controller.
Weather - Weather radar returns are displayed on the EHSI when WX mode 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 upper left side of the EHSI presentation and on the
lower left side of the multifunction display (MFD).
EHSI CAUTION OR FAILURE ANNUNCIATIONS
Amber caution annunciations will appear to indicate the following situations:
DME Hold - When the DME is selected to HOLD, an amber H will appear to the left
of the DME readout on the EHSI.
FMS Alert Messages - Waypoint (WPT), dead reckoning (DR), or Degrade (DGR) messages
appear in amber at the upper center-left of the EHSI presentation to
indicate, respectively, that a waypoint is being passed, the FMS is in
dead reckoning, or the FMS navigation has become degraded for any of
various reasons. MSG annunciated in amber at the top center-right of
the EHSI 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 dashes.
Target Alerts - An amber TGT on the left of the EHSI indicates weather radar target
alert. A green TGT annunciation indicates that target mode has been
selected on the weather radar.
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 both the pilot and copilot select 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.
Heading Comparator HDG annunciated in amber at the top center-left of the EHSI display ind-
Warning - cates that the comparator system has detected an excessive difference
between the two heading indicators.
Red failure annunciations will appear in the following instances and locations:
Heading Failure - A heading failure will result in the following indications: heading and
bearing annunciations and bearing pointers will disappear; HDG FAIL
appears at top of heading dial. HDG, CRS SEL, and DTRK will dash.
Deviation Indicator Failures - A failure in the vertical deviation or glideslope system will result in
removal of the applicable pointer and a red X being drawn through the
scale.
Vertical Speed Display - A red X will be drawn through the scale.
I 3-58 Configuration AA 56OMB-01