Design considerations in Boeing 777 fly-by-wire computers
Yeh, Y.C.
Boeing Commercial Airplanes, Seattle, WA;
This paper appears in: High-Assurance Systems Engineering Symposium, 1998. Proceedings. Third IEEE International
Publication Date: 13-14 Nov 1998
On page(s): 64-72
Meeting Date: 11/13/1998 - 11/14/1998
Location: Washington, DC, USA
ISBN: 0-8186-9221-9
References Cited: 18
INSPEC Accession Number: 6104521
Digital Object Identifier: 10.1109/HASE.1998.731596
Current Version Published: 2002-08-06
Abstract
The new technologies in flight control avionics systems selected
for the Boeing 777 airplane program consist of the following:
fly-by-wire (FBW), the ARINC 629 data bus, and deferred maintenance. The
FBW must meet extremely high levels of functional integrity and
availability. The heart of the FBW concept is the use of triple
redundancy for all hardware resources: the computing system, airplane
electrical power, hydraulic power and communication paths. The multiple
redundant hardware is required to meet the numerical safety
requirements. Hardware redundancy can be relied upon only if hardware
faults can be contained; fail-passive electronics are necessary building
blocks for the FBW systems. In addition, the FBW computer architecture
must consider other fault tolerance issues: generic errors, common mode
faults, near-coincidence faults and dissimilarity
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