Column - Garmin GTN 750 Pilot's Manual Upgrade Supplement

An altitude constraint is invalid if:
Foreword
• Meeting the constraint requires the aircraft to climb
Getting
• Meeting the constraint requires the aircraft to exceed the maximum flight
Started
path angle (6° downward) or maximum vertical speed (-4,000 fpm)
Audio &
Xpdr Ctrl
• It results in a TOD behind the aircraft's current position
• It is within a leg type that does not support altitude constraints
Com/Nav
• It is added to a waypoint past the FAF
FPL
The altitude restriction from the database displays when the following three
conditions are present.
Direct-To
1. A pilot-specified altitude constraint is deleted
Proc
2. Navigation database contains an altitude restriction for the lateral
waypoint
Charts
3. A predicted altitude is not available
Wpt Info
Once added to the flight plan, an altitude constraint may be modified or
deleted using the controls in the VNAV Options menu. Select a value in the ALT
Map
column to display available options.
Traffic
Selection
Terrain
Type
Weather
Altitude
Data Entry
Nearest
Services/
Revert
Music
Constraint
Utilities
System
Remove
Constraint
Messages
Symbols
Appendix
4-34
Index
• Opens a list of available constraint types
• Options: At, At or Above, At or Below, and Between
• Opens a keypad. Specify an altitude value for the selected
constraint type
• Unit options: MSL, AGL, and Flight Level
• Returns a modified altitude constraint to its original published
value
• Removes the VNAV designation from the altitude
• Value remains displayed for reference purposes. It is no longer
used to compute vertical guidance
• Removing the VNAV designation from an altitude may
invalidate other displayed altitudes or cause them to change
after recalculation
Table 4-7 Altitude Constraint Options
GTN 725/750 Pilot's Guide
Function
190-01007-03 Rev. Q