CREW
AWARENESS
AIRPLANE
OPERATIONS
MANUAL
2-04-05
Page
16
Code
01
JUNE 28, 2002
FAILURE MODES
The system is developed to avoid absence of information in most of
the failure combinations.
The failures that may affect the crew awareness system are
associated with electrical power supply or computer malfunctions. In
both cases, the system architecture is such that only major failures will
lead to loss of information presentation. Even in this condition, crew will
still have essential data available to safely continue the flight, using
standby instruments.
ELECTRICAL SYSTEM FAILURES
Each display is supplied in such a way that in case of failure in one or
more electric buses, the remaining buses will still be supplying one or
more displays.
This feature is achieved by supplying all displays with four different
buses (two DC Buses and two Essential buses). Furthermore, each
pair of duplicated displays (PFDs, MFDs, and RMUs) are supplied by
different buses, one for each display.
COMPUTER FAILURES
Since both IC-600s receive data from duplicated sources, a single
failure will not lead to loss of information addressed to the flight crew.
In case of any source failure, the reversionary panel permits shifting
between existing sources, thus using cross side information. This
feature may be used only when the system is not capable of providing
information through normal means.
DISPLAYS FAILURES
In case of any failure in the PFD or EICAS displays, the corresponding
information may be presented in one of the remaining displays, by
using the reversionary panel. The MFD may present other display
information, but its data may not be presented in the remaining
displays.
If all displays are lost, the RMU is capable of providing essential flight
data.
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