Avidyne IFD540 Manual de Instalação descarregar pdf (Página 173)

5-15 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.

WAAS APPROACHES

LPV (RNAV) approaches are the preferred approach for the IFD,

if available. The IFD is configured at the time of installation for

whether it is a WAAS-capable unit or a non-WAAS-capable unit.

If non-WAAS, the following procedures do not apply.

When GPS has been selected as the nav source, and one of the

RNAV/GPS approach types with vertical guidance (LPV, L/VNAV,

LNAV+V) is selected in the FMS, the IFD will transmit horizontal

and vertical deviation for use by any integrated external display

device.

There are several types of WAAS approaches. The FMS will

automatically select the best available approach based on current

GPS integrity and will indicate the selection in the Nav Mode

datablock field.

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Avidyne IFD540 Manual de Instalação Página 173