What is
DO-178B Level A? DO-178B Level A software is software whose anomalous behavior, as shown by the system safety assessment process, would cause or contribute to a failure of system function resulting in a catastrophic failure condition for the aircraft. Failure of DO-178B Level A software could be typified by total loss of life. Approximately 20-30% of avionics systems and 40% of avionics software code must meet DO-178B Level A criteria.
What is
DO-178B Level B? DO-178B Level B software is software whose anomalous behavior, as shown by the system safety assessment process, would cause or contribute to a failure of system function resulting in a hazardous/severe-major failure condition for the aircraft. Failure of DO-178B Level B software could be typified by some loss of life. Approximately 20% of avionics systems and 30% of avionics software code must meet DO-178B Level B criteria.
What is
DO-178B Level C? DO-178B Level C software is software whose anomalous behavior, as shown by the system safety assessment process, would cause or contribute to a failure of system function resulting in a major failure condition for the aircraft. Failure of DO-178B Level C software could be typified by serious injuries. Approximately 25% of avionics systems and 20% of avionics software code must meet DO-178B Level C criteria.
What is
DO-178B Level D? DO-178B Level D software is software whose anomalous behavior, as shown by the system safety assessment process, would cause or contribute to a failure of system function resulting in a minor failure condition for the aircraft. Failure of DO-178B Level D software could be typified by minor injuries. Approximately 20% of avionics systems and 10% of avionics software code must meet DO-178B Level D criteria.
What is
DO-178B Level E? DO-178B Level E software is software whose anomalous behavior, as shown by the system safety assessment process, would cause or contribute to a failure of system function with no effect on aircraft operational capability or pilot workload. Failure of DO-178B Level E software would have no impact on passenger or aircraft safety. Approximately 10% of avionics systems and 5% of avionics software code must meet DO-178B Level E criteria (note however that the amount of DO-178B Level E sourcecode is increasing due to passenger entertainment and internet communications subsystems that are currently designated Level E; it is deemed likely by us that the criticality levels of these systems will increase due to integration with other, more critical, avionics systems).
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