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The navigation part of the FMS may be considered an area navigation
system or RNAV.
Its fundamental purpose is to provide navigation
information relative to a selected geographically located point.
Navigation management will allow the pilot to define a route from the
aircraft present position to any point in the world.
The system will
output advisory information and steering signals to allow the pilot or
DAFCS to steer the aircraft along the desired route. Routes are defined
from the aircraft present position to a destination waypoint via a direct
great circle route or via a series of great circle legs connected by
intermediate waypoints.
In addition to providing a lateral steering signal, the navigation
computer also provides vertical navigation (VNAV). The VNAV modes are
VNAV altitude (VALT), VNAV altitude preselect (VASL), VNAV flight level
change (VFLC), and VNAV vertical path guidance (VPTH). The vertical
command is proportional to the calculated distance from the desired
vertical path.
VNAV allows the pilot to define waypoint altitudes and
descent angles to waypoints and command autopilot to fly the desired
vertical path.
The PZ-800 Performance Computer's fundamental purpose is to aid the pilot
in determining the optimum airspeed/engine setting for his particular
flight conditions. In addition, the performance computer functions as an
autothrottle computer to directly control the A/C throttles or as
guidance to the pilot to optimize thrust management.
The performance portion of the FMZ-800 system has two primary operating
modes advisory mode only and full active coupled mode.
The advisory mode
could be considered a flight director in that it advises the pilot on
proper airspeeds and engine settings. It is up to the pilot whether he
wishes to fly the advisory information or ignore it. The full active
mode causes the autopilot and the engine controls to automatically track
the changing airspeed and throttle advisories. The pilot can review
other data while the remains coupled to a previous mode.
The computed airspeed and engine settings can be displayed on the EICAS
display unit or coupled to the SM-81O Servo to control the aircraft's
throttles to provide automatic tracking of the changing airspeed and
engine settings.
In addition to the real time calculations, preflight or flight planning
and takeoff calculations are part of the system. "What=if" modes have
been included so the pilot can determine whether a high altitude is more
appropriate than his current altitude, even if it has a greater headwind.
The joystick is an added feature for entering in a waypoint into the
flight plan using a slewable cursor. The new waypoint is defined by
latitude-longitude and can be entered directly into the flight plan.
22-14-00
Page 17
Aug 15/91
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