Edz-884 Electronic Display System (Eds) - Honeywell SPZ-8000 Maintenance Manual

2. D. EDZ-884 Electronic Display System (EDS)
The EDZ-884 EDS is comprised of the following components:
_ DU-880
. SG-884
c DC-884
FC-880
DA-884
DP-884
Display Units (PFD, ND, and EICAS)
Symbol Generators (SG1, SG2, SG3)
Display Controllers (DC)
Fault Warning Computers (FWC)
Data Acquisition Units (DAU)
Dimmer Panel
The EDS displays pitch and roll attitude, heading, course orientation,
flight path commands, weather presentations, mode and source
annunciations, air data parameters, engine data, and fault warning
information.
The primary features the EDS brings to the flight control system are
display integration, flexibility, and redundancy. Essential display
information from sensor systems, and automatic flight control,
navigation, performance, and caution-warning systems is integrated into
the pilot's prime viewing area. Each symbol generator is capable of
driving six DU-880 displays, such that in case of a symbol generator
failure, one of the remaining symbol generators drives the PFD and ND
displays on both sides and the EICAS displays. In the case of a DU-880
Display Unit failure, the PFD takes priority over the ND. In the case of
an EICAS display failure, a compacted EICAS format can be displayed on
either EICAS DU-880 Display Unit.
The symbol generator (SG) functions as the data processor for the display
system. It receives digital and discrete inputs, organizes this
information into the correct formats as defined by the display
controller, and transmits these formats to the display units. All analog
information is input to the EDS through the DAU. The DAU transmits this
data to the SG over the ASCB.
The symbol generators in the display system are identical and directly
interchangeable e. When the display system is in its normal (no failure)
configuration, SG1 drives the pilot's displays, SG2 drives the copilot's
displays, and SG3 drives the EICAS displays.
The fault warning computer (FWC) is primarily responsible for supplying
data to the symbol generators for display of warnings, cautions, and
advisories, engine data, and system pages on the EICAS displays. It
receives data directly from various aircraft systems and from the ASCB
for other aircraft and avionics systems.
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