SPZ--8000 Digital Integrated Flight Control System
A28--1146--055
REV 2
Modes of Operation
8-50
VERTICAL NAVIGATION MODE
Pushing the VNAV button on the flight guidance controller selects the
vertical navigation mode and overrides all active pitch flight director
modes. In the VNAV mode, the AFCS tracks the vertical flight profile of
the FMS with the following submodes possible:
D Vertical Flight Level Change (VFLC) -- VFLC operates the same
way as FLC except that the target speed and altitude from the FMS
are used for climb or descent. VFLC also engages if VALT is
engaged and the FMS initiates a climb or descent, or if VALT or
VPTH arm is engaged and the FLC button on the flight guidance
controller is pushed. The FMS FLC mode is annunciated on the
EADI and on the advisory display as VFLC.
NOTE: The FMS works with the flight guidance system so that a
flight level change is never commanded past the alert
altitude set on the EADI.
D Vertical Altitude Select (VASL) -- VASL operates the same way as
the altitude preselect mode. VASL arms as soon as VFLC or VPTH
is engaged. The FMS altitude preselect mode is annunciated on the
advisory display as a white ASEL. When the mode captures, VASL
is displayed on the EADI. The mode annunciator flashes for 5
seconds to indicate the transition from arm to capture. VASL is
displayed on the advisory display in reverse video for 5 seconds,
then in normal text. VASL is cancelled whenever VALT mode
engages.
D Vertical Altitude Hold (VALT) -- VALT operates the same way as
the altitude hold mode. VALT engages automatically after VASL has
captured the target altitude. VALT also engages whenever the
VNAV button is pushed and the aircraft is within 250 feet of the FMS
target altitude. The FMS altitude hold mode is annunciated by VALT
on the EADI and on the advisory display.
To Next Page
Loading...
