Garmin G1000 King Air C90GT - Manual (Page 429)

190-00663-01 Rev. A Garmin G1000 Pilot’s Guide for the Beechcraft C90A/GT 415
AUTOMATIC FLIGHT CONTROL SYSTEM
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
When a descent leg is captured (i.e., vertical deviation becomes valid), Vertical Path Tracking becomes
active and tracks the descent profile (Figure 7-15). An altitude capture mode (‘ALTS’ or ‘ALTV’) is armed as
appropriate.
Figure 7-15 Vertical Path Tracking Mode
VNV Target Altitude
Capture Armed
Vertical Path
Tracking Active
GPS is Selected
Navigation
Source
Terminal
Phase of
Flight
Command Bars Indicate Descent to
Maintain Required Vertical Speed
VNV Target
Altitude
Required
Vertical
Speed Bug
Vertical Deviation
Indicator (VDI)
If the altimeter barometric setting is adjusted while Vertical Path Tracking is active, the flight director
increases/decreases the descent rate by up to 500 fpm to re-establish the aircraft on the descent path (without
commanding a climb). Adjusting the altimeter barometric setting creates discontinuities in VNV vertical
deviation, moving the descent path. For large adjustments, it may take several minutes for the aircraft to re-
establish on the descent path. If the change is made while nearing a waypoint with a VNV Target Altitude,
the aircraft may not re-establish on the descent path in time to meet the vertical constraint.