Ok, thanks. Thought they might have given you a reason. Probly doesn't affect your "older" a/c, but Boeing and Honeywell (I think) found some possible interference with the gen 3 or series 3 screens produced by honeywell that are fitted to some 737 NG and the 787. Testing on the 787 revealed the issue I think. There is a bulletin somewhere from Boeing. Have read it, but don't have it. Actually, think it was here in Tech Log that I found the link to the bulletin. I'll see if I can find it again.