Originally posted by 3WE
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Localizer signals get distorted, particularly by large metal objects on the taxiway near the array. GPS is more infallible and is already driving the predictive aspect of EGPWS. That system knows your track and where it is currently taking you. I, for one, cannot think of a normal scenario where the track would be to the adjacent taxiway in the final moments of the approach. Maybe you can. But, if we have EGWPS for vertical proximity issues DESPITE THE INSTRUMENTS AND THE WINDOWS, why not throw in a lateral aspect as well? Especially if it is a mere software revision.
I don't think we desperately need it. I also don't think aviation got safer because we only pursued the absolutely necessary. It got safer because we looked at the potential dangers, used our imagination and applied safeguards where they were practical and not detrimental. And when that one-in-a-million plane was prevented from landing with the gear up, it paid off, didn't it...
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