RVDT, thats exactly what I did as I thought that surely it can't be a good thing to have a rad alt unavailable in such circumstances. On ours the Rad Alt is still on, does yours drop off, as your earlier pits suggests?
Silsoe, I apologise if I'm teaching granny to suck here but can you confirm that you didn't have ground power plugged in because I'd have put a fair bit of beer on the rad alt not being powered!
Cheers
TeeS
Edited to say I've just seen your post 1103 SS and I think that answers my question.