airway_2 - CASA/AA MOU.AIRWAYS-2(0 Advisory Circular July...

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July 1999 CASA/AA MOU.AIRWAYS-2(0) Software and its use in Safety Critical Systems The relevant regulations and Orders This Advisory Circular should be read in conjunction with the Civil Aviation Safety Authority document “Safety Regulation of Airservices Australia and Aerodrome Rescue and Fire Fighting Service Providers - Final Draft Regulatory Arrangements and Standards - April 1996”. That document is available on request from CASA at the address at the foot of this page. Who this Advisory Circular applies to This Advisory Circular applies to airways service providers. Why this publication was written This Advisory Circular provides guidelines for safety management during the acquisition, development and implementation of airways systems where software is used to perform safety critical functions. Note that throughout the text references are shown inside square brackets. Status of this Advisory Circular This is the first issue of CASA/AA MOU.AIRWAYS - 2(0). It remains current until re-issued, withdrawn or superseded. For further information Further information is available from the Airways and Airspace Standards Branch of CASA. The address details are as follows: Post: Airways and Airspace Standards Branch Civil Aviation Safety Authority GPO Box 2005 CANBERRA ACT 2601 Telephone : 131757 FAX : 02 62171700 Advisory Circular July 1999 This publication is only advisory. It describes recommended principles for safety management of airways sytems where software is used to perform safety critical functions. Contents . ... Definitions 2 Guiding principles 2 Integrated system safety effort 3 Specified Integrity levels 3 Conservative system architecture and technologies 3 Process and product based safety assurance 4 References 7
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2 CASA/AA MOU/Airways-2(0): Software and its use in Safety Critical Systems July 1999 1. DEFINITIONS Airways service : An air traffic service, aeronautical information service, search and rescue service, aeronautical radio navigation service, aeronautical telecommunications service, or rescue and fire fighting service. Airways system : Facilities, equipment, personnel and procedures, which in combination, provide an airways service. (Airways systems also encompass airspace systems used for air traffic services.) 2. GUIDING PRINCIPLES FOR USE OF SOFTWARE IN SAFETY CRITICAL SYSTEMS 2.1 Airways systems being deployed today are not only increasingly complex and integrated, but also more and more based on the relatively new and continually evolving technology of software. It has therefore become imperative to consider safety aspects by a structured approach commencing early in the life-cycle of a system, preferably at the operational concept phase. 2.2
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airway_2 - CASA/AA MOU.AIRWAYS-2(0 Advisory Circular July...

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