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• Above each NX line is the vertical speed required to follow
the defined vertical flight path to that VNAV waypoint.
• All VNAV waypoints must lie ahead of the FMS present
position and must be sequenced in the same order as they
occur on the lateral flight plan.
7. If vertical flight guidance is desired to the "TO" VNAV waypoint,
press line select key [1R] to access the TGT V/S field and enter
the desired vertical speed. Invalid entries will cause the V/S
entry to flash, and an error message will be displayed (see
following section).
Section V
Operations
5-70 2423sv602
Change 1
8. When the TO VNAV waypoint and the TGT V/S entries have
been made, the distance to the TOD will be displayed as well as
Flight Path Angle. Vertical Deviation indication will be
referenced to the flight path defined by the first VNAV waypoint
and VSR. TOD is the point at which the pilot should begin the
capture maneuver for the FPA.
9. When the aircraft reaches the last programmed VNAV waypoint,
subsequent VNAV waypoints will automatically fill with current
VNAV altitude, causing guidance to be to zero VSR and
maintaining level flight.
VNAV Error Messages
The following error messages will appear on the VNAV page
whenever an invalid entry is made in TGT V/S or altitude data fields.
V/S TOO HIGH - Value exceeds 6000 fpm or maximum flight path
angle programmed in configuration module.
V/S TOO LOW - Entered value is less than minimum required value.
ADC ALT INV - (1) Aircraft altitude is < FL180 and only pressure
altitude is available, or (2) ADC altitude is failed.
CLR XFILL ALT - A VNAV plan is defined, but crossfilled altitude is
being used by the system.
CLEAR MAN ALT - A manual entry for altitude was made on the
ADC status page.
LEG RESTRICTION - The FMS is on a Procedure turn, VECTOR or
other floating leg type.
XTK TOO HIGH - Current crosstrack is > 12.5 nm.
CLR SXTK - Aircraft is flying a selected crosstrack distance prior to
VNAV activation.
FPA TOO STEEP - Flight path is steeper than maximum FPA in
configuration module.
Section V
Operations
2423sv602 5-71
Change 1
VNAV Descent Mode Procedure
The vertical navigation descent mode is activated by crossing the
Top-Of-Descent point while in the cruise mode or by selecting the
Vertical To (VTO) function.
Waypoint sequencing occurs automatically when the computed
straight line flight path angle exceeds the configured maximum FPA.
1. Note the TGT V/S value. Whenever VNAV waypoints are
sequenced, the TGT V/S is initialized to the VSR for the new TO
waypoint. Using line select key [1R] to access the entry field, a
different value may be entered at any time.
2. Above FR PPOS is the vertical deviation of the aircraft above (+)
or below (-) the desired vertical flight path.
3. Beneath FR PPOS is the distance to the TO VNAV waypoint and
the vertical speed required to cross the VNAV waypoint at the
target altitude from the present position, altitude, and
groundspeed.
Section V
Operations
5-72 2423sv602
Change 1
VNAV Direct-To Procedure
This procedure is designed to redefine an already established VNAV
leg in the event ATC restrictions do not allow following the originally
programmed vertical route. For example, suppose that the original
vertical plan was to begin a descent from FL 390 at waypoint ABC
and arrive over waypoint XYZ at FL 210. However, if the descent
clearance is not received until 30 NM past ABC, the following
procedure will zero the vertical deviation indicator (glideslope
needle) so as to allow a straight-line descent and arrival over XYZ at
FL 210 from the present position and altitude.
1. Press the VNAV function key to access the VNAV page.
2. Press the VTO line select key to access the VERTICAL TO
page.
3. Enter the reference number of the desired VNAV Direct-To
waypoint.
4. If the computed flight path angle is greater than the configured
maximum FPA, the reference number will flash, indicating that
the path is too steep and cannot be engaged.
Section V
Operations
2423sv602 5-73
Change 1
VNAV Flight Profile Deletion
1. Press the VNAV function key to access the VNAV page.
2. Press any TO or NX line select key.
3. Enter the number "99."
4. The vertical flight profile will be deleted and the VNAV pages will
fill with the next 9 waypoints on the FPL.
VNAV Enroute Pitch Commands with Collins or
Honeywell EFIS
If the installation includes an interface with a Collins, Bendix/King or
Honeywell Flight Guidance System (FGS) that is compatible with the
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