Mini-X Installation, Setup & User Manual GRT Avionics
Revision A9 66
7.4 Synthetic Approach (SAP)
The Mini-X has the capability to draw a
synthetic approach path to any runway
in the navigation database. The
approach path is marked by Highway-
In-The-Sky boxes (also known as HITS)
that are aligned with runway heading
and follow a glide angle (usually 3
degrees) to the touchdown zone. This
manual covers the button presses
necessary to capture the approach. For
more detailed information about flying
the synthetic approach with all GRT EFIS
systems, please see the GRT Horizon User’s Guide, Rev. C.
WARNING:
Synthetic Approach is derived from a non-certified VFR GPS and VFR navigation
database waypoints which may not be accurate.
Synthetic Approach paths have not been
evaluated for obstacle and terrain clearance, and therefore are not approved for IFR use.
Synthetic Approach is available only when the following conditions are met:
2. The last waypoint in the flight plan is an airport included in the GRT navigation database with
information about runway orientation, position, and elevation, OR –
3. An approach has been loaded into a connected IFR GPS navigator and the EFIS is able to
determine the selected airport and runway from that.
4. AHRS, Air Data Computer and GPS data are valid.
Capture of the SAP should occur:
�
Within 20 miles of the destination airport
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2.5 degrees off of the extended runway centerline or localizer course
�
On a preferred intercept angle of 45 degrees or less, but can occur at any angle.
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When the aircraft is below glideslope intercept altitude. Abrupt dives can occur when the
aircraft intercepts the SAP above the glide path.
Flying the Synthetic Approach
1. Ensure the last waypoint in the active GPS flight plan is the destination airport. If the autopilot is
installed and engaged, it can capture the synthetic approach from any mode.
