Volume thoughtfully queried:
Does anybody know by heart the frequency range tested during L/HIRF certzification tests? (there must be some FAA-AC around specifying the frequencies to be tested), and does anybody know the "low frequency" used to communicate with subs? Are we talking kHz range, or lower?
Maybe nobody thought of such low frequency high energy radio transmissions when designing the electromagnetic shielding of the computers ?
Although physics still works about the same as in the past, the character of possible radio waves and transmission schemes, at nearly all wavelengths and energies, has become much more complex over the last twenty years. The is the result of significant innovative developments in electronic components, in novel signal generating and processing means, and other bits of technology that depart ever further from the serenely pure model of a basic Marconi wireless - the model that often prevails in specifications and testing for EMI toughness in systems and products.
This is not a proper place for discussion or detail about exotic advances in electromagnetrickery, mumble, mumble, but your suggestion,
Volume, that industry standard testing specs and methods re EMI are out of date and insufficient may be valid, in light of quite recent developments, and possibly is worth pursuing further in a more formal context.