TM 1-1510-225-10
3B-85
h. Vertical Navigation.
(1) Vertical Navigation (VNAV) Overview.
The FMS-800 VNAV function provides guidance for a
climb or descent to an assigned altitude at a waypoint
or crossing fix in STAR or initial approach procedure.
It also provides situational awareness for climb and
descent planning and allows fuel-efficient descents
with adjustments for actual wind.
Vertical guidance is not provided during holding
pattern, DME arc, course reversal, intercept, or pattern
execution. Also, it is not provided for vertical path
segments that extend into the previous flight plan leg.
(2) Assigning an Altitude or Flight Level.
VNAV guidance requires an altitude or Flight Level
(FL) to be entered at a waypoint in the flight plan. If an
active flight plan is transferred from the alternate flight
plan, all altitudes assigned at waypoints are also
transferred. When an altitude has been assigned to a
waypoint it is indicated by a V attribute on the right
side of the Flight Plan page waypoint line. To delete
this altitude assignment enter a dash – and press the
right adjacent line select key, or press the upper left
line select key if on the Flight Plan Waypoint page.
Figure 3B-48. Normal Parallel Offset Transition
