Garmin G1000 Piper PA-46 Matrix - Manual (Page 436)

Garmin G1000 Pilot’s Guide for the Piper PA-46 Mirage/Matrix 190-01108-00 Rev. B 422
AUTOMATIC FLIGHT CONTROL SYSTEM
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EICAS
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 7-14). An altitude capture mode (‘ALTS’ or ‘ALTV’) is armed as
appropriate.
Command Bars Indicate
Descent on Glidepath
Figure 7-14 Vertical Path Tracking Mode
Terminal
Phase of
Flight
GPS is
Selected
Navigation
Source
VNV Target Altitude
Capture Armed
Vertical Path
Tracking Active
Required
Vertical
Speed
Indication
(RVSI)
Vertical Deviation
Indicator (VDI)
VNV Target
Altitude
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.