Yes, I agree. Consider a blind landing in fog, which is very common, safe, and a
matter of routine with suitably equipped aircraft and runways. You really do not
want either of the two radio signals which give vertical and lateral guidance to
be corrupted. Now, if the system detects corruption (at least two out of three
computers agreeing), the aircraft will abort the landing attempt and climb away
safely, which is a very real and expensive nuisance, but not a disaster, but if
the spurious signal seems genuine, disaster is likely. The same sort of thing
needs to be considered for modern GPS-based systems too. They are quite easily
jammed over a short range by inexpensive equipment, and the same thing may
happen by accident due to poorly designed portable electronic equipment. Much
stuff of Chinese origin has a fake CE mark (actually "China Export") and bogus
FCC approvals, so who knows what it might be radiating? [ Reply to This | Parent | # ]
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