Avidyne IFD540, Pilot'S Manual

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5-22 Navigation
BACK COURSE APPROACHES
This system is designed to fully support flying back course
localizer approaches. To perform a back course approach,
ensure the Nav Source is VLOC and the front course value is set
via the Course Set knob on the external course input device (e.g.
CDI, HSI, EFIS, etc.).
If the published back course approach is entered into the FMS,
the IFD nav source will automatically toggle from “GPS
VLOC”
to “VLOC” when all transition criteria have been met outside the
FAF and it will automatically tune the localizer frequency into the
active nav channel. The Nav Mode datablock should display the
localizer IFD, landing airfield ID and the front course runway ID.
When integrated with an EFIS (e.g. Avidyne PFD, Aspen PFD,
etc), the front course may need to be manually entered and then
“Back Course” should be displayed on the EFIS.
As soon as the system determines that it is established on the
back course localizer, the IFD will transmit deviation data such
that the external indicators (CDI, HSI, EFIS, etc) will display
correct sensing (i.e.
not reverse sensing), if the front course is
the set course.
PROCEDURE TURNS AND HOLDS IN LIEU OF PROCEDURE
TURNS
Both of these maneuvers, when part of a published procedure,
appear as normal legs in the flight plan and therefore have no
special or different procedures – just fly them as part of the flight
plan.