Avidyne IFD540 Manual de instalación descargar pdf (Pagina 175)

5-17 Navigation

approach remains a non-precision approach and does not

consider any step-down limitations. The Nav Mode datablock will

display “LNAV+V” for the approach type.

LNAV/VNAV (Lateral Navigation with Vertical Navigation)

In this mode, the GPS provides lateral navigation, providing more

accurate guidance than regular LNAV but easier to follow

indications than a localizer. The vertical navigation is driven by

GPS signals. LNAV/VNAV approaches are operationally different

from LNAV+V in that the glide path is protected from obstructions

but attention still must be applied to step down fixes. Also, the

minimum altitude presented is a decision altitude/height (DA/DH)

– DA being what is on the altimeter, and DH being the height of

the DA above the touchdown zone elevation. This is not a MDA,

thus, fly it just as though it were an ILS approach: follow the glide

slope all the way to the DA before initiating a missed approach, if

appropriate. The Nav Mode datablock will display “LNAV/VNAV”

for the approach type.

LPV (Localizer Precision with Vertical Guidance)

The lateral guidance is significantly more precise than LNAV, and

equivalent to that of a localizer. Vertical guidance is provided to

minimums as low as 200’ AGL above the touchdown zone.

Lateral tolerance starts out at 0.3 NM full-scale (slightly tighter

than a localizer at the FAF), transitioning to 350 feet either side at

the runway threshold (slightly looser than a localizer). The

steering remains linear all the way without the difficult to follow

swings of a VHF localizer. The vertical guidance is precise and

has a DA/DH (shown as “DA(H)” on approach charts) rather than

a MDA. The Nav Mode datablock will display “LPV” for the

approach type.

LP (Localizer Performance)

These approaches have localizer performance but no vertical

guidance associated with them. Use the published “LP”

minimums. The Nav Mode datablock will display “LP” for the

approach type.

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Avidyne IFD540 Manual de instalación Pagina 175