Eclipse 500 System Manual page 441

Section 16. Autoflight Eclipse 5OO Systems Manual
Figure 290. PITCH and ROLL Hold Flight Mode Annunciations
HEADING SELECT/HOLD
Heading mode is selected by pressing HDG on the autopilot control panel. When
heading mode is engaged the flight director will turn towards the magenta heading
bug on the compass rose and HDG appears as the active mode in the flight mode
annunciation window. The flight director will follow the direction of the turn as
indicated by the twisting of the heading knob on the autopilot control panel.
Therefore, if commanded, the flight director will turn past 180° if the HDG-SEL knob
is turned in that direction. The heading bug is available for use when the flight
director is disengaged or engaged. It is adjusted by rotating the HDG-SEL knob on
the autopilot control panel. Pushing the HDG-SEL knob will synchronize the heading
with the aircraft's current heading.
The heading bug is displayed in one of two ways, hollow, or solid. A solid heading
bug display indicates the autopilot/flight director is using the heading bug as a target.
NAV
Nav mode allows the autopilot/flight director to follow the navigational guidance
provided by the primary navigation source selected on the left PFD. These NAV
sources can be VOR, LOC, or FMS.
If a VOR frequency is the selected navigation source on the PFD, the flight director
will use the deviation of the green Course Deviation Indicator (CDI) to compute
guidance in order to center it. The course is set by using the lower left concentric
knob on the PFD. When arming the navigation mode using a VOR frequency, VOR
text appears as the armed mode in the flight mode annunciation window. When the
autopilot captures the VOR course, VOR appears, pulses for three seconds, and then
becomes steady as the active mode. If the autoflight system detects that the aircraft
is flying over the station, the flight director will hold the current heading until the VOR
signal becomes usable again. The FMA indication will not change.
If a localizer frequency is selected as the navigation source on the PFD, the flight
director will use the deviation from the CDI in order to compute guidance in order to
center it. When arming the navigation mode using a LOC frequency, LOC appears
as armed in flight mode annunciation window. When the autopilot captures the LOC
course, LOC appears, pulses for three seconds, and then becomes steady as the
active mode.
If the Flight Management System is selected as the primary navigation source on the
PFD, the flight director will use a roll steering command directly from the FMS to
provide lateral guidance. When arming the navigation mode using a FMS frequency,
FMS appears as the armed mode in the flight mode annunciation window. When the
autopilot captures the FMS course, FMS appears, pulses for three seconds, and then
becomes steady as the active mode.
PITCH HOLD
Pitch hold is the other primary function of the autopilot and is activated as a default
mode for vertical navigation if no previous mode is selected, or when a higher mode
(ALT, ALT CHG, GS) becomes unavailable without a subsequent flight director mode
present. To utilize pitch hold, press the A/P OFF/ON button to turn on the autopilot, if
Copyright © — Eclipse Aviation Corporation
Version 2.0 April 2007
421