Originally Posted by
skeebo2
" why is it only being demanded for the A300/310?"
Because its plastic/fiberglass and glued on.
My guess you could dance on any older: Boeing, Douglass, Lockheed type rudder. You might wrinkle or bend it but, it woun't shear off.
Your "guess" would be wrong, at least according to
Boeing's engineers, but what do they know, they're obviously biased!