Working notes
Shorter working notes on the things that come up repeatedly — standards, radiation, obsolescence, and the beliefs that quietly cost programmes a year.
Most of the expensive mistakes on a first DAL-A programme are not technical. They are beliefs about what the standard requires, held confidently, that turn out to be wrong at the second review.
Applying a margin to a datasheet number is not radiation engineering. It is a way of feeling better about not having tested, and it fails in a specific and predictable way.
Aircraft stay in service for decades. The semiconductors inside them do not. Most programmes discover this in year nine, at the worst possible moment, and treat it as a procurement problem.
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