Pilot's Guide

Garmin G1000 Pilot’s Guide for the Beechcraft C90A/GT/GTi
190-00663-03 Rev. A64
FLIGHT INSTRUMENTS
VERTICAL DEVIATION
The Vertical Deviation Indicator (VDI; Figure 2-14) uses a magenta chevron to indicate the baro-VNV vertical
deviation when Vertical Navigation (VNV) is being used; the VDI appears in conjunction with the “TOD within
1 minute” alert. Full-scale deflection (two dots) is 1000 feet. The VDI is removed from the display if vertical
deviation becomes invalid. See the Flight Management and AFCS sections for details on VNV features, and refer
to Section 2.2, Supplemental Flight Data, for more information about VNV indications on the PFD.
The Glideslope Indicator (Figure 2-15) appears to the left of the Altimeter whenever an ILS frequency is tuned
in the active NAV field and the aircraft heading and selected course are within 107˚. A green diamond acts as
the Glideslope Indicator, like a glideslope needle on a conventional indicator. If a localizer frequency is tuned
and there is no glideslope, “NO GS” is displayed in place of the diamond.
The glidepath is analogous to the glideslope for GPS approach service levels supporting SBAS vertical guidance
(LNAV+V, LNAV/VNAV, LPV). When a GPS approach of one of these service levels is loaded into the flight plan,
GPS is the selected navigation source, and SBAS is used for vertical approach guidance, the Glidepath Indicator
appears as a magenta diamond (Figure 2-16). If the approach type downgrades past the final approach fix
(FAF), “NO GP” is displayed in place of the diamond.
While executing an LNAV/VNAV approach and SBAS is unavailable, 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 GPS Status page
Baro-VNAV is also the source of vertical approach guidance if the LNAV/VNAV procedure does not support
SBAS vertical guidance.
While baro-VNAV is active, the Glidepath Indicator appears as a magenta pentagon (Figure 2-17). If the
approach type downgrades past the final approach fix (FAF), “NO GP” is displayed in place of the pentagon.
While executing an LNAV/VNAV or RNP approach and between the FAF and MAP, excessive deviation
indicators appear as vertical yellow lines (Figure 2-17) to indicate an area where the vertical deviation exceeds
±75 feet.