SPZ--8000 Digital Integrated Flight Control System
A28--1146--055
REV 2
8-51
Modes of Operation
D Vertical Path (VPTH) Mo de -- VPTH mode is used to fly a fixed
flightpath angle to a vertical waypoint during descent. The VPTH
mode engages whenever the FMS initiates a path descent, which
can occur while in VFLC or VALT modes. When the mode captures,
VPTH is displayed on the EADI. The mode annunciator flashes for
5 seconds to indicate the transition from arm to capture. VPTH is
displayed on the advisory display in reverse video for 5 seconds,
then changes to normal text. VPTH mode is cancelled by VASL
mode capture. To fly the VPTH mode, the following parameters are
entered on the FMS control display unit (CDU):
— The desired aircraft altitude
— The distance TO/FROM the waypoint
— An angle of descent (if the pilot wants to fly a particular flightpath
angle).
All of the other normally entered VNAV parameters, such as station
elevation and DME distance to station are automatically input
through the navigation computer , or they are called up from the FMS
database.
For a complete description of VNAV operation, refer to the
applicable Flight Management System Pilot’s Operating Manual.
NOTE: VNAV must be disengaged below 400 feet AGL.
To Next Page
Loading...
