A recent incident involving a
synthetic vision display triggered thoughts about the certification of increasingly compelling instruments against the caveat of "not to be used for primary navigation nor rely on it ..."
At what point should certification judge operational acceptability.
If the reliability of individual equipment and format is judged to be suitable for 'use', then how should the wider system involving single point failure of an input sensor be judged.
Is this form of technology creating more operational 'catch 22s', or should any form of synthetic vision display be considered as a primary display for certification?
"Don't use this system because we told you not to"; but the system is so compelling that without removal or warning it is most likely to be used.
Who judges, how, and where does the responsibility for this reside in certification - the suitability for use of complex systems?