Vertical Navigation Mode (Vnav) - Honeywell PRIMUS 1000 Pilot's Manual

R
PRIMUS 1000 Integrated Avionics System

Vertical Navigation Mode (VNAV)

The VNAV mode can be used only with the VNAV menu on the MFD.
It is used to descend to an altitude at a specific VOR/DME or FMS–
defined waypoint. The waypoint can be defined as being on a course
TO or FROM a station. Altitude is automatically captured by the VNAV
mode. Use the MFD bezel menu to enter the waypoint altitude and other
required data. The glideslope scale on the PFD is replaced with a VNAV
vertical deviation scale. The deviation is shown relative to the flight path
angle. Typically, angles of 1_ or 2_ are chosen for climbs, and an angle
of 3_ is used for descents.
Although it is not often used for climb, VNAV can be used to define a
climb profile.
Any vertical navigation path data generated by an FMS is used for
advisory purposes only. However, if the FMS can couple vertical
guidance, consult the appropriate flight manual supplement for
additional information on this subject. In dual FMS installations, it is
possible to select different FMSs for the PFD and the MFD. The flight
director uses data from the PFD to compute the VNAV angle (VANG).
In the VNAV mode, a single vertical waypoint can be defined and
coupled to another waypoint for automatic transition. The waypoint can
be defined as direct from the present position or preselected to begin
at some future time. Table 6–10 describes the VNAV mode data entry
procedure.
Step
1 Select the navigation source (VOR, FMS).
2 Set, capture, and track the course on the coupled–side
HSI.
NOTES:
3 Set the waypoint altitude with the ALT knob. The value is
displayed in the ALT window.
Modes of Operation
6-40
1. If VOR/DME is being used, verify that the DME is not in
HOLD.
2. The course must be either directly to or from the station.
Course changes over the station do not correctly compute
the path.
VNAV Mode Data Entry Procedure
Table 6–10 (cont)
Procedure
A28–1146–134
REV 1 Jan/03