Garmin G1000 NXi Pilot’s Guide for the Cessna NAV III
190-02177-02 Rev. A
50
FLIGHT INSTRUMENTS
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL FEA
TURES
APPENDICES
INDEX
While executing an LNAV/VNAV approach, and between the FAF and MAP, the Vertical Deviation Limit
Indicators appear as vertical white lines (following figure) indicating the area where deviation exceeds allowable
limits for the glidepath. The Vertical Deviation Limit Indicator provides a scaled representation of ±75 feet of
the calculated glidepath. The “window” between the lines represents the area of acceptable deviation. The
length of the lines will change while progressing through the final approach, but the area between the lines will
still represent ±75 feet. When the Glidepath Indicator enters an excessive deviation area, the Glidepath and
Vertical Deviation Limit Indicators become amber.
While executing an LNAV/VNAV approach and SBAS is unavailable or disabled, Baro-VNAV (barometric
vertical navigation) is used for vertical guidance. This occurs due to any of the following conditions:
-
SBAS fails or becomes unavailable prior to the FAF
-
The aircraft is outside of SBAS coverage
-
SBAS is manually disabled on the ‘Aux - GPS Status’ Page
Baro-VNAV is also the source of vertical approach guidance if the LNAV/VNAV procedure does not support
SBAS vertical guidance. Garmin’s Baro-VNAV system is automatically temperature-compensated for the final
approach segment. In context of GPS LNAV/VNAV approaches, the system generated GlidePath is automatically
compensated for temperature variation in both SBAS and Baro-VNAV modes; therefor, the uncompensated
Baro-VNAV temperature restriction published on some LNAV/VNAV approach plates does not apply.
However, in regards to approach altitudes and minimums, cold temperature limits (as indicated by a snowflake
symbol on the approach plate) may apply in accordance with regulatory agency requirements. Thus, manual
entry of temperature compensation for approach loaded altitudes and approach minimums may be done. For
more information, refer to the Flight Management Section.
Figure 2-13 Example of Approach with Cold Temperature Limit
Restriction does not
apply to Garmin’s
Baro-VNAV system
Cold Temperature
Limit requires
manual entry
of temp. comp.
for approach
loaded altitudes
and approach
minimums
While Baro-VNAV is being used, the Glidepath Indicator appears as a magenta pentagon. If the approach
downgrades past the final approach fix (FAF), “NO GP” is displayed in place of the pentagon.
