Continuous Safety Risk Evaluation by Example
CARNEGIE-MELLON UNIV PITTSBURGH PA PITTSBURGH United States
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This note demonstrates continuous Safety Risk Evaluation of an aircraft using the SAE International standard Architecture Analysis and Description Language AADL for embedded software systems and the safety analysis capability of the Open Source AADL Tool Environment OSATE. Any similarity of the example use cases to real aircraft incidents is purely accidental. The objective is exercise is To illustrate the importance of including lower Design Assurance Level DAL components in a safety risk analysis, To include the pilots role in the overall system safety analysis, To perform safety risk analysis throughout the product life cycle - even when aircraft are already in operation. We proceed by first describing the elements of the model and then discussing several use scenarios for which we assess the safety risk by performing a fault tree analysis that calculates the probability of a catastrophic aircraft incident.
- Computer Programming and Software