Honeywell SPZ-8000 - AA-300 Radio Altimeter System; ADZ-81 O Air Data System; LASEREF II Inertial Reference System (IRS)

2. System Descrii)tion
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The SPZ-8000 DAFCS consists of the following subsystems which are described
in paragraphs 2.A through 2.N.
● LASEREF@ II Inertial Reference System (IRS)
● ADZ-81O Air Data System
● AA-300 Radio Altimeter System
G EDZ-884
● DFZ-820
. PRIMUS@
c PRIMUS@
6 FMZ-800
Electronic Display System (EDS)
Dual Flight Guidance System
800 Weather Radar System
870 Weather Radar System
Flight Management System (FMS)
. Engine Pressure Ratio System
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. VLF/Omega System (Optional)
● LSZ-850 Lightning Sensor System (Optional)
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. TCZ-91O Traffic Alert and
● MLZ-850 Microwave Landing
. Global Positioning System
Collision Avoidance System (Optional)
System (Optional)
(Optional)
The SPZ-8000 is a complete automatic flight control system providing fail-
operational execution of flight director guidance, autopilot, yaw damper, and
trim functions. The automatic path mode commands are generated by the FZ-820
Flight Guidance Computer which integrates the attitude and heading reference,
air data, EDS, and FMS into a complete aircraft control system that rovides
Rthe stabilization and control needed to ensure optimum performance t roughout
the aircraft flight regime.
A central serial communications network provides inter-subsystem communi-
cations within the system. The network is denoted by the nomenclature
avionics standard communications bus ASCB). This bus structure uses
advanced communications techniques an
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safety design features to rovide high
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through-put, fail-operationaldata exchan e within the System. T e ASCB
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consists of two serial synchronousdigita communications buses.
Each bus is
electrically isolated from the other bus. In addition, each bus can
communicate bidirectionally.
Refer to paragraph 3 for a detailed description
of the ASCB.
The ASCB interfaces the automatic flight control system with the digital air
data system, the IRS, the EDS, and the FMS systems. Each subsystem
broadcasts on the ASCB when directed to transmit by the bus controller, and
returns to an off condition when its time slot expires.
The bus controller
function is triplex and is contained in each symbol generator. Only one bus
controller is active at a time.
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Page 9
Apr 15/93
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