Garmin G300 Pilot’s Guide190-00921-00 Rev. E 207Integrated AutopilotSystemOverviewFlightInstruments EISCOMInterfaceGPSNavigationFlightPlanningHazardAvoidanceAdditionalFeaturesIntegratedAutopilot Annun/Alerts Appendix IndexIf the altimeter’s barometric setting is adjusted while VNAV mode is active,the Integrated Autopilot increases/decreases the descent rate by up to 500 fpmto re-establish the aircraft on the descent path (without commanding a climb).For large changes, it may take several minutes for the aircraft to reestablish onthe descent path. If the change is made while nearing the VNAV waypoint, theaircraft may not reestablish on the descent path in time to level off at the VNAVTarget Altitude. In this case, the Integrated Autopilot will revert to Pitch Holdmode upon passing the VNAV waypoint, and Selected Altitude Capture (ALTV)mode will be automatically armed.AUTOMATIC REVERSION TO PITCH HOLD MODESeveral situations can occur while VNAV Mode is active which cause theIntegrated Autopilot to revert to Pitch Hold Mode:• Vertical deviation exceeds 200 feet during an overspeedcondition.• Vertical deviation becomes invalid (the Deviation Indicator isremoved from the PFD).Following a reversion to Pitch Hold Mode, VNAV Mode and theappropriate altitude capture mode become armed to allow for possibleprofile recapture.VNAV TARGET ALTITUDE CAPTURE MODE (ALTV)VNAV Target Altitude Capture is analogous to Selected Altitude CaptureMode and is armed automatically after the AP VNAV Softkey is pressed ifthe VNAV Target Altitude is to be intercepted before the Selected Altitude.The annunciation ‘ALTV’ indicates that the VNAV Target Altitude is to becaptured. Refer to Section 2.3 (Vertical Navigation) for more informationon setting up the VNAV target altitude.As the aircraft nears the VNAV Target Altitude, the Integrated Autopilotautomatically transitions to VNAV Target Altitude Capture Mode withAltitude Hold Mode armed. This automatic transition is indicated bythe green ‘ALTV’ annunciation flashing for up to 10 seconds and theappearance of the white ‘ALT’ annunciation.
