Case in point: JPI Engine monitors. I thought it was inop in a friend's
plane until I took off my polarized sunglasses.

Marco

"Aaron Coolidge" wrote in message
...
: Some of the instruments have polarised glass themselves. Some glass will
snip
In addition the lexan/polycarbonate windows of aircraft have a polarizing
effect of they are under any amount of strain.
--
Aaron C.