On Friday, September 22, 2017 at 4:21:56 PM UTC-4, John Carlyle wrote:
Oh, Darryl - think like a lawyer? Can't - I'm a physicist, legal thinking "does not compute".

- yeah, after all these years I still cannot make any sense of the wording "any aircraft that was not originally certificated with an electrical system, or that has not subsequently been certified with such a system installed". Had it said "nor" instead of "or", perhaps? (I do have a degree in physics.)