Arrivals / Approaches / Landing
6-11
ensure the Primary Nav LSK has selected “Nav1” or “Nav2” and
the front course value is set via the Course Set knob (left hand
IFD knob). Alternatively, if the published back course approach is
entered into the FMS, all of the above is done automatically.
As soon as the system determines that it is established on the
back course localizer, the HDI source label indicates “LOC
BCRS” and both the HDI and CDI display correct sensing. For
autopilot-coupled approaches, ensure the NAV button is pressed.
SBAS APPROACHES
LPV (RNAV) approaches are the preferred approach for the
combined IFD-DFC100 system, if available.
When “FMS” has been selected as the source in the “Primary
Nav” LSK, and one of the RNAV/GPS approach types with
vertical guidance (LPV, L/VNAV, LNAV+V) is selected in the
FMS, the ADI will provide horizontal and vertical guidance by
means of the CDI, HDI and VDI.
SBAS approaches must be flown with the DFC100 system in
NAV APPR mode and the “Primary Nav” LSK set to FMS. For a
full approach, the autopilot will remain in NAV throughout the
approach. For a vectors-to-final approach, the autopilot will be in
HDG with NAV armed until the final approach course is captured,
and then it will switch automatically to NAV. For those SBAS
approaches that have a vertical guidance component, once the
aircraft is on final, the GS mode will also engage.
There are several types of SBAS approaches. The FMS will
automatically select the best available approach based on current
GPS integrity and will indicate the selection as the HDI source.
The pilot must monitor the HDI source throughout the approach
and use charted minimums appropriate to the approach type. If
an approach type is not indicated by the time the final approach
fix (FAF) is reached and the HDI source is given as FMS,
do not
descend
– the conditions required to fly the approach have not
been met and you must fly the missed approach procedure.
SBAS approach types that may be indicated as the HDI source
include:
LNAV (Lateral Navigation)
Provides lateral (horizontal) guidance
only, with standard GPS precision of 0.3 NM full-scale deflection.
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