4-2
Approach Procedures
4 Approach Procedures
GENERAL BEHAVIOR
The integrated DFC90 and PFD system is designed to take full
advantage of the auto transition capability of the GNS-430 units
for flying a GPS flight plan ending in an ILS approach.
Note: For those aircraft that are not equipped with a 430-family GPS Nav-Com,
the Aspen PFD converts the signals such that the DFC90 should behave in
accordance with these descriptions.
If the GPS or NAV does not support an input,
the Aspen PFD sends the input as invalid to the DFC90.
Provided the GPS Nav-Com
“ILS CDI Selection” is set to Auto,
and VLOC was not manually selected by the pilot on the PFD Pri
Nav line select key, at an appropriate time on the approach, the
CDI course is automatically set to the inbound localizer course
and the Pri Nav source is automatically toggled from GPS to
VLOC resulting in a hands-free transition with the proper course
dialed in the PFD Course setting. If the navigator
either doesn’t
have the capability or,
hasn’t been set up to Auto toggle the ILS
CDI selection, or VLOC was manually selected in the Avidyne
PFD Pri Nav field, or AUTOCRS is disabled (Aspen PFD
configurations) it is required that the inbound course be set using
the PFD course set knob for accurate localizer intercept and
tracking.
Note that “GS” mode as annunciated refers to a generic
glideslope, encompassing both ILS glideslope and GPS WAAS
approach vertical guidance.
Note that for all approaches except VORs, APPR mode will
automatically arm when NAV is armed. VORs require the pilot to
press the APPR button.
APPROACH MODES
WAAS APPROACHES
When “GPS1” or “GPS2” has been selected as the source in the
“Primary Nav” LSK, and one of the GPS approach types with
vertical guidance (LPV, L/VNAV, LNAV+V) is the selected
approach, the ADI will provide horizontal and vertical guidance by
means of the HDI (LDI on Aspen) and VDI.
Change 3
