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Concept of Dynamic Safety of Aviation (CoDySa)


Research and Development of Mathematics Models, Hardware and Software for Dynamic Safety of Aviation

Tech Area / Field

  • SAT-AER/Aeronautics/Space, Aircraft and Surface Transportation
  • INF-COM/High Performance Computing and Networking/Information and Communications
  • INF-DAT/Data Storage and Peripherals/Information and Communications
  • INF-SOF/Software/Information and Communications
  • MAN-COM/CAD and CAM/Manufacturing Technology

3 Approved without Funding

Registration date

Leading Institute
Russian Academy of Sciences / Institute of Control Sciences, Russia, Moscow


  • Karlsruhe University / Institute of Industrial Information Technology, Germany, Karlsruhe\nUniversity of Sunderland / School of Computing, Engineering and Technology, UK, Sunderland\nTadpole-RDI, USA, CA, Carlsbad\nUniversity of North London, UK, London\nCity University / Centre for Software Reliability, UK, London\nUniversity of Central Florida / Department of Electrical and Computer Engineering, USA, FL, Orlando\nNational Technical University of Athens / Mechanical Engineering Department, Greece, Athens

Project summary

During the time it took to write of this proposal (1998-1999) half a hundred of airliners crashed -
American, German, Korean, Sweden and Russian. So, in spite of the confident talk by operators and manufacturers, there is still a lot of scope for improvement in the safety of aircraft in flight.
Current safety systems depend on the passive approach. On-board devices monitor the aircraft's various systems in flight and these readings are recorded by ground-based facilities.
It is only after an event, normally a crash, that any attempt is made to analyze the information that has been collected. Then, hopefully, the cause of the problem can be found and steps taken to prevent a second accident from happening.
But what if you need to prevent the first accident? This was question that Dr. Igor Schagaev set out to answer in 1987, when he first formulated his radical new approach to safety in flight: CoDySa - the Concept of Dynamic Safety.
CoDySa is an active safety system. The systems on the aircraft itself and the on-ground facilities are combined in one seamless system that no longer merely monitors events, but reacts to them as they occur. This approach has only recently been made possible by advances in technology. Prototypes of the entirely new hardware and software systems required have already been developed for military purposes in conjunction with two Russian aviation companies. These vastly improved systems, combined with the completely new approach of CoDySa, offer the opportunity for a huge advance in the safety and reliability of civilian flight.
What is needed now, and what this project sets out to achieve, is the development and testing of a full-scale working prototype of the complete system. This would include all the hardware and software, on the ground and in the air, needed to prove the value of CoDySa for civilian application. Analysis of the results from these tests will make it possible for the improvement in flight safety and long-term cost savings offered by CoDySa to be quantified.
Full details of the progress made in the development of CoDySa to date may be found in the numerous papers published by Dr. Schagaev and his colleagues.
All the theoretical work necessary to realize CoDySa has already been completed. Public presentations were made at international conferences in Germany in 1992 and Russia in 1993. The economic benefits of CoDySa were first outlined at the IAP annual conference in London in 1994. Several companies have been trying to develop systems along these lines, amongst them Westinghouse, Teledyne Control, NASA, Boeing and British Aerospace. But none of these companies is yet in a position to attempt a full-scale realization incorporating both the on-board and the ground-based systems. They do not yet have full understanding of CoDySa principles, the detailed hardware or software specifications necessary to ensure the required level of reliability. Thus it will be some time before they can even begin to put such sophisticated systems into production.
Successful realization of the Concept of Dynamic Safety depends on the solution of problems in two main areas. An exceptionally high degree of fault tolerance is required in the electronics, which monitor and analyze the on-board data during flight and transmit them to the ground, and this has to be backed up by reliable real-time processing on the ground.
The know how in fault tolerant computer design built up over a ten year period at ICSAN and ATLAB, and in particular the leading-edge performance of the Tadpole computer systems concept, have provided an unprecedented level of technological support for the Concept of Dynamic Safety. Another important problem to solve within framework of this proposal is problem of mechanical stiffness and reliability of on-board hardware. Existed results and solutions developed by members of a team of this proposal if applied for on-board hardware enable to achieve tolerance to 1000G overload. The first working prototype of an on-board fault tolerant computer was realized as early as 1994 by the FTC branch of ICSAN (Russia), working with ATLAB LTD (UK).
Reliability of on-board hardware for CoDySa has been tested for periods estimated as 700,000 hours, achieving availability during that time of more than 98%. RAM structures with better than 98% availability over a mean life of 750,000 hours have already been developed and tested in avionics applications using Micron military memory chips and Motorola military processor chips. These structures and the technology of the on-board subsystems were developed with the assistance of ATLAB Ltd. A full working prototype of an on-board fault tolerant safety system computer was developed and tested for the Sukhoy 27M fighter.
The ground-based systems necessary to realize CoDySa depend on a combination of specially dedicated software, upgraded standard software and the special hardware developed by team proposing this project. Fault tolerant functioning also makes an essential contribution to the reliability of the on-ground subsystems of the CoDySa project.
Some of the key parameters to be provided by the on-board and on-ground equipment are given below:
Specifications On-Board On-Ground

Bits, frequency, MHz 64, 500 64,500

MTTF, hours 500000+ 350000+
Availability 0.99 0.99
Data Volume, GB 2-8 16-24
Volume, liters 2 4-5
Peak overload, no less 1000G 10G
Weight, kg 3-3,5 5-8


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