GH-3100
Installation & Operation Manual
Page 5-32
Operation
TP-559
March 30, 2017
Revision K
5.3.5.6.1 FMS Descriptor
Based on the FMS Descriptor configuration option, when in FMS Mode the source of the deviations is
identified with the “FMS,” “FMS1,” “FMS2,” “FMS3,” “FMS4”, “GPS,” "GPS1", "GPS2", “NAVL,” or
“NAVR” descriptor.
5.3.5.6.2 To / From Annunciation
When in FMS Mode the bus data determines when to display the TO or FROM descriptors.
5.3.5.6.3 Course Deviation
When in FMS Mode and Crosstrack Scaling is not configured for AUTO, the left/right deviation bar
assumes one of two mutually exclusive sub-modes, Enroute, or Approach Modes. The FMS crosspointer
deviation outputs and the APR annunciator use these two modes.
5.3.5.6.4 Vertical Deviation
When in FMS Mode and the CROSSTRACK SCALING is configured to Auto and the VERTICAL
SCALING is configured to AUTO then FMS Vertical Deviation is shown.
5.3.5.6.5 Distance To Waypoint
The data bus provides the Distance-To-Waypoint data. When in FMS Mode the Distance-To-Waypoint is
shown in nautical miles with a resolution of 0.1 NM for distances under 100 NM, and a resolution of 1
NM for distances of 100 NM and greater.
5.3.5.6.6 Desired Track / Selected Course
The display of Desired Track or Selected Course is dependent on the FMS navigator.
5.3.5.6.7 Bearing To Waypoint
When in FMS Mode, Bearing to Waypoint data and a descriptor is shown as the bearing from the present
aircraft position to the active waypoint, if FMS Bearing On has been chosen in the main menu.
5.3.5.6.8 FMS Magnetic / True North Reference
The Desired Track, Selected Course and Bearing To Waypoint are referenced to “Magnetic North” or
“True North” depending on the FMS navigator mode of operation and the unit configuration.
NOTE
When in TRUE mode, the desired track/course arrow (↑) is removed
from the magnetic heading tape.
5.3.5.6.9 FMS Annunciators
The FMS Annunciators section defines the modal logic that controls what graphical information (if any)
is shown on the screen.
5.3.5.7 FMS Invalidities
An FMS Invalidity term means that some set of conditions exist such that information that is received or
should have been received on the current ARINC input bus either is not received, is received with the No
Computed Data Bits, or other data errors.
When the main menu has been used to turn off graphical display of any FMS data item, that item remains
blank even if invalidating conditions for that display item occur and other requirements would otherwise
mandate some display action.
