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VERTICAL NAVIGATION SECTION (VNAV KEY)
Upon pressing the VNAV Key the VNAV 1/3 Page will be displayed
and the following can be observed.
VNAV PAGES
NOTE: AFIS flight plans do not support any altitudes, including air-
port elevation. As a result no altitude constraints will be provided for
SIDS, STARS or Approaches. If the airport, SIDs, STARS or
Approaches are obtained from the database altitudes will be provid-
ed.
In some programmed approaches, the altitude associated with the
MAP waypoint is computed from the FAF through the MAP waypoint
to a point 50 feet above the runway threshold. MDA may be reached
prior to the MAP waypoint. The MDA must be observed if the run-
way is not in sight.
VNAV 1/3 (Page 1 of 3)
VNAV MODE:
Mode required to fly to the vertical TO waypoint and Baro Altitude in
feet. Can display one of the following:
• INVALID: Indicates VNAV function is invalid. In order to be set
valid the following must be met:
1. Air Data valid (baro altitude and altitude rate)
2. Valid lateral TO Waypoint
3. Valid vertical TO waypoint
4. NO SXTK programmed
5. Crosstrack (XTK) < 12.5NM
• INACTIVE: VNAV system is not activated because non-volatile
memory was erased during software update or it was manually set
inactive before shutdown. Pressing the BACK Key with the cursor
over the inactive field can display one of the following:
NOTE: When VNAV Mode is inactive, all external VNAV outputs are
disabled, including VERT DEV, EFIS altitude constraints at waypoints
and VNAV WPT ALERT annunciation.
Page Display Definitions
2-32
GNS-XL Flight Management System
Rev. 0
Oct/96