I heard that the nose radar in the old P-3s could 'cook' the transistor radios in the BX...(from former aircrew).
Entirely possible the big ground based sets of the day could disrupt flight systems.
Don't know if that happened, but just extrapolating from what I know about electronics (trained on communications, radar and microwave equipment back in the day before going to oilfield equip). Think the scenario is very plausible.
The more miniaturized and sophisticated the *Tronics* the more it's susceptible to EMP and RF interference, that's just a fact we may learn about the hard way one day.
I can even envision that a technically advanced civilization wouldn't even think about protection from high powered RF, something that was 1000 years or more outdated to them.
To draw a half-ass analogy, I don't think much about a medieval catapult, but one could still ruin my house and my day pretty easily :^)