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Change 1
FR PPOS - The FROM waypoint is always PPOS (present position)
and is used for calculating the Vertical Speed Required to reach the
TO VNAV waypoint at the specified altitude.
"TO" VNAV waypoint
Vertical Speed
Required
distance to TO waypoint
distance to TOD
PPOS TGT V/S
Between the FR and TO lines are:
• The Great Circle Distance, expressed in nautical miles,
between the aircraft's present position and the TO VNAV
waypoint.
• The Vertical Speed Required (VSR) to descend (or climb)
from the aircraft's present position (plus offset distance) and
altitude to cross the TO VNAV waypoint at the target altitude.
Section V
Operations
2423sv602 5-65
Change 1
TO and NX [2L, 3L, 4L, 5L] - Each TO and NX VNAV waypoint is
defined by a flight plan waypoint and the offset distance prior to (-) or
beyond (+) that flight plan waypoint. Next to the VNAV waypoint
location is the target altitude for that vertical waypoint. During VNAV
waypoint entry, when the associated line select key is pressed, the
Vertical Waypoint Select page is accessed for selection of a flight
plan waypoint. When the flight plan waypoint is entered on the
Vertical Waypoint Select page, the VNAV display will return to the
VNAV Cruise page with the cursor over the offset distance entry
field. Pressing the ENTER key expands the cursor to cover the
target altitude entry field. Altitudes may be entered as Flight levels
(3-digit entry 000 to 640) or as whole altitudes (15,500, for example).
Altitudes below 640 feet must be entered as 4 digits (for example
0500 for 500 feet). VNAV waypoint altitudes must be in level or
descending sequence in the range from 0 to +64034 ft. An altitude
will be invalid, and will flash until it is corrected, if it results in a FPA
greater than the maximum programmed into the Configuration
Module at installation (maximum configurable is 9.9°).
Above each NX line is the vertical speed required in feet per minute,
at the present groundspeed, to follow the vertical flight path between
the target altitudes of each VNAV waypoint.
For waypoints after the last programmed VNAV waypoint, altitude of
the last waypoint will automatically pre-fill into succeeding waypoints.
When the aircraft reaches the last programmed VNAV waypoint,
VNAV guidance will be to zero VSR and will maintain level flight.
VTO [5R] - This line select key is used to access the Vertical TO
page. This allows vertical flight guidance from the aircraft's present
position and altitude to the selected VNAV waypoint target altitude.
Section V
Operations
5-66 2423sv602
Change 1
VNAV Waypoint Select
VNAV waypoints must lie on the flight plan route. They are defined
by first entering a desired flight plan waypoint and then entering any
offset mileage prior to or beyond that flight plan waypoint.
Selecting a VNAV waypoint entry field on the VNAV Cruise or
Descent page accesses this page. The flight plan waypoint is
entered on this page by using the numeric selection entry process.
When a VNAV waypoint is entered, the display will return to the
previous page and the cursor will be over the offset distance entry
field.
FR PPOS [1L] - This line displays along track offset ahead of PPOS
that TOD and VSR are referenced to in Cruise mode. This display is
not used during descent.
TO and NX [2L, 3L, 4L, 5L] - When this page is displayed, the
cursor will be over the waypoint entry field corresponding to the one
selected on the Cruise or Descent page. The cursor will be prefilled
with the reference number of the FPL waypoint already in use in that
VNAV waypoint position, or will be blank if none exists.
Section V
Operations
2423sv602 5-67
Change 1
All VNAV waypoints must be ahead of the FMS present position and
must be sequenced in the same order they occur on the lateral flight
plan. When a VNAV waypoint is entered:
• If the preceding VNAV waypoint in the VNAV profile list follows
it in the lateral flight plan; the new waypoint will flash to
indicate an invalid entry.
• If the position in the VNAV profile list was occupied that
waypoint (and any subsequent ones) will advance to the next
VNAV waypoint position(s), provided it follows the new
waypoint in the lateral flight plan. If it precedes the new
waypoint in the lateral flight plan, it will be removed from the
VNAV profile.
• Any VNAV waypoints following the new waypoint in the profile
list which precede the waypoint in the lateral flight plan will be
removed from the VNAV profile.
Flight Plan Waypoints - On the right side of the display is a list of
　
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