Either the AAIB made a mistake in this claim or the industry has an immense problem. Either way the AAIB's final report will be very interesting.
Regards, Tanimbar
Unknowns are just that. They do not necessarily signify an immense problem.
They are expected to be accounted for as part of the underlying risk in our lives for anything that we design. It's the knowns that we apply processes to address.
I don't expect the AAIB to solve the problem, but leave it to the industry (manufacturers and regulators) to reduce the degree of the unknowns in this regard.