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Originally Posted by Lo Zeno
Actually, thanks to nowadays instruments and computers, it's very easy.
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No it's not.
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Ok, to be honest: it's easy to quantify and even foresee the effects that electronic devices will have on other electronic devices, which I admit is not the same as quantifying the complete risks, but still it's the starting point.
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Don't confuse quantifying the effect of one electronic device on another with quantifying the effect of an unknown set of unknown devices with an unknown distribution through the aircraft on a hugely complex electronic system.
Bear in mind that Certification of devices is far from perfect - for example EM emissions from devices will be dependent on the software those devices are running. it is certainly not usual to re-certify a device for each new software version.
/JB