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GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. P
FPL
Indication
Color
Description
White
• Altitude calculated by system
• Estimate of aircraft altitude as it passes over the
navigation point
• Absence of bar(s) indicates it is not a potential
constraint
• Altitude retrieved from navigation database
• Bar above and/or below the value indicates constraint
type
• Altitude is for reference only. Not for use in
determining vertical guidance
Cyan
• Altitude designated for use in determining vertical
guidance
• Pencil icon indicates manual designation or manual
data entry
• Constraint invalid
• System cannot use altitude to determine vertical
guidance
Table 4-1 Altitude Constraint Color Conventions
An altitude constraint is invalid if:
• Meeting the constraint requires the aircraft to climb
• Meeting the constraint requires the aircraft to exceed the maximum flight
path angle (6° downward) or maximum vertical speed (-4,000 fpm)
• It results in a TOD behind the aircraft's current position
• It is within a leg type that does not support altitude constraints
• It is added to a waypoint past the FAF
Summary of Contents for GTN 625
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