Fault Tolerance Techniques of The Boeing 777 Samuel
Fault Tolerance Techniques of The Boeing 777 Samuel Hishmeh December 6 th, 2006 Fault Tolerance Techniques of the Boeing 777
Background o o Boeing to Develop “Fly-By-Wire” Fly-By-Wire Advantages n n o Safer Cheaper Revolutionized Flight Fault Tolerance Techniques of the Boeing 777
Design Considerations o o Cosmic Rays Hardware Failures “Fly-By-Wire” Functional Separation No Single Fault can Cause Failure Fault Tolerance Techniques of the Boeing 777
Design Philosophy o REDUNDANCY n Triple Modular Redundancy (TMR) o o n Computing System Electrical Power Hydraulic Power Communication Path 4 Modular Redundancy o Actuator Control Electronics Unit (ACE) Fault Tolerance Techniques of the Boeing 777
Flight Control Surfaces Fault Tolerance Techniques of the Boeing 777
Fault Tolerance Techniques of the Boeing 777
Primary Flight Computer Fault Tolerance Techniques of the Boeing 777
ACE Hardware Fault Tolerance Techniques of the Boeing 777
Communication Bus o o o o ARINC 629 Line Replaceable Units (LRU) Triple Modular Redundancy CRC Checking Asynchronous Serial 2 MHz Physical and Electrical Isolation Fault Tolerance Techniques of the Boeing 777
Communication Bus [2] Fault Tolerance Techniques of the Boeing 777
Flight Modes o 3 Modes n n n Direct Secondary Normal Fault Tolerance Techniques of the Boeing 777
Honorable Mentions o o Deferred Maintenance Electrical Isolation CRC Checks Line Replaceable Units (LRU) Fault Tolerance Techniques of the Boeing 777
Questions… Fault Tolerance Techniques of the Boeing 777
References o o Y. Yeh. Triple-triple redundant 777 primary flight computer. In Proceedings of the 1996 IEEE Aerospace Applications Conference, volume 1, pages 293– 307, February 1996. Y. Yeh. SAFETY CRITICAL AVIONICS FOR THE 777 PRIMARY FLIGHT CONTROLS SYSTEM. In Digital Avionics Systems, 2001. DASC. The 20 th Conference, Volume 1, pages 1 C 2/1 -1 C 2/11, October 2001. Fault Tolerance Techniques of the Boeing 777
CRC Diagram Fault Tolerance Techniques of the Boeing 777
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