HazelNuts39:
Thanks Pugilistic Animus;
I understand the IPH is educational rather than regulatory, and find this statement somewhat simplistic:...
The FAA, when left to its own devices, tends to internalize. That doesn't happen with certification regulations because they are very thoroughly vetted with industry (powerhouses like Boeing and AB).
Advisory Circulars are sometimes vetted very well but other times not.
Publications like the IPH are not vetted at all; rather they are the product of staff of varying competency and experience within the organization.
I give them an "E" for effort, but that is about it.