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Right, PJ2; the WXR would annunciate failure of its attitude input with WXR ATT. SAT annunciates when the combination of pitch and roll exceed (saturate) the mechanical limits of the antenna to scan with respect to the horizon. That takes at least 45 degrees bank.
STAB, IIRC, is pilot selectable: de-selecting stabilization input.
Regardless, with no attitude input, the WXR will scan wings level, as if the plane were at 0 pitch and 0 bank.
While not annunciated, the unlikely case of the flat plate falling off the antenna pedestal will result in zero return, which would be obvious to the pilot.
As for ice on the radome, the only case I have heard was an MD-80 on approach to KLAS. The display went full red. Once at the gate, they took a half hour delay for chipping ice off the radome.
GB
Last edited by Graybeard; 14th Jul 2009 at 00:19.
Reason: SAT for STAB