Arrivals / Approaches / Landing
6-13
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.
This type of approach is automatically coupled to the autopilot,
meaning that somewhere in the vicinity of the FAF, with “L/VNAV”
annunciated as the HDI source, the FMS will automatically toggle
the autopilot mode to NAV APPR and GS will either arm or
engage depending on your position relative to the glide path.
LPV (Localizer Precision with Vertical Guidance)
(FMS900w only)
The lateral guidance is significantly more precise
than LNAV, and equivalent to that of a localizer, except easier to
fly. 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 so you don’t get the difficult to follow swings of a VHF
localizer close to the runway. The vertical guidance is precise and
has a DA/DH (shown as “DA(H)” on approach charts) rather than
a MDA.
If the FMS has determined that satellite coverage is insufficient
for use of GPS as the primary navigation source, a Caution is
provided. This may occur at any time during the approach and
requires that you execute a missed approach.
Summary of Contents for Entegra
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