Originally posted by Evan
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I've been told that RadAlts are notoriously erratic, and exist mostly for automation, and the terrain may have been quite uneven there, so maybe they based their glide slope on the QNE information and disregarded the Radalt readings.
AFAIK RadAlt readings are erratic over uneven terrain, trees or bulidings, but that "erraticity" is of the oreder of magnitude of those features.
That is, not significative you are supposed to reamin at the MDA (typically about 400ft AGL)
Also, I think the Radalts were recent upgrades on this plane, so they probably weren't accustomed to relying on them.
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