4. c. PZ-800 Performance (Autothrottle) Computer
The PZ-800 provides two distinct functions. They are described in this
section separately as performance function and autothrottle function.
(1) Performance Function
The PZ-800 contains a digitized flight manual. Entries via the CDU
allow the PZ-800 to calculate the desired performance values.
(a) Performance Initialization
Performance initialization requires entries from the pilot in
order to enable the performance calculations.
These
entries
are
in addition to the active flight plan which contains
lateral information and may contain vertical information.
Flight planning, climb, cruise, descent, and engine-out
portions of the flight can be calculated using the performance
initialization entries. If the calculation of takeoff and
landing data is desired, additional entries are required.
(b) Performance Planning
The performance planning function for the
active flight plan
has two primary activities.
Prior to takeoff, the performance
planning function calculates and displays the
fuel and time
required for the flight using the selected cruise altitude,
step climb increment,
and selected speed mode. If the optimum
cruise altitude is used, it is calculated and displayed. These
calculations are based on the data entered during performance
initialization.
Following takeoff, the performance planning
function updates the fuel and time calculations to reflect
actual conditions and changes that the pilot may enter.
Display of performance planning information includes predicted
fuel remaining and estimated time enroute (ETE) at each
waypoint.
Performance planning for a stored flight plan can be obtained.
This is done by specifying the initialization data to be used
on the the stored flight plan to be used.
This function could
be utilized by the pilot to examine alternative flight routings
or future flight plans.
The PZ-800 in conjunction with the NZ-920 Navigation Computer
form the core of the Honeywell flight management system (FMS).
The FMS can accept flight plans from an external source such as
lockheed jetplan.
Once the flight plan is entered as the
active flight plan,
the performance planning function is the
same as for a pilot-entered flight plan. Following performance
initialization, the performance planning calculations are
performed for the flight plan which has been loaded from the
external source.
The computer does not use the performance
values (e.g., fuel flow and fuel remaining) computed by the
flight planning service.
22-14-00
Page 298.166.l/298.166~2
Apr 15/93
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