Cockpit Reference Guide

Garmin G1000 Pilot’s Guide for the Piper PA-46 Meridian
190-00763-02 Rev. A
416
AUTOMATIC FLIGHT CONTROL SYSTEM
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EICAS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICESINDEX
Whena descentlegis captured(i.e., verticaldeviation becomesvalid), Vertical Path Trackingbecomes
activeandtracksthedescentprole(Figure7-13).Analtitudecapturemode(‘ALTS’or‘ALTV’)isarmedas
appropriate.
Figure 7-13 Vertical Path Tracking Mode
Command Bars Indicate Descent to
Maintain Required Vertical Speed
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 ight 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.