Is a "breakover feature" required for airliner seats? A "breakover feature" in airline seats is supposed to  assist in absorbing head impacts during a crash, when the passengers are in the brace position. However in some scenarios, most notably the forced water landing of  US Airways Flight 1549, the NTSB investigation found that the seats did not have this feature, which led to shoulder injuries in some of the passengers who were in the brace position.

My questions are:


Is it mandated by the FAA that seats in all commercial airliners
should have a breakover feature?
As a passenger, how do I know if the seats in my plane have this feature?
If the seats don't have such a feature, is it still wise to adopt the brace position in case of a crash or forced landing?
I can't speak to the regs, but my understanding of the brace was primarily to protect your head, not being as exposed to any debris, and not having very far to travel to bang against something. 

As far as I understand (and I'm less sure of this), your back being in a curved position like this is better able to absorb impact/jarring than if it's vertical and you drop suddenly, or are whipped forward and backward by suddenly arresting horizontal motion.