Why is it that rig manufacturers seem to have to "authorize" the use of a particular brand of AAD in their rigs? Seems to me that if the AAD fits in the mounting points that rig is equipped with, that there is no need for "authorizing". My thinking is this: if a rig manufacturer uses a Tempo reserve for their drop tests, they don't have to write letters "authorizing" the use of PD, Precision, etc. reserves in their rigs. Why is one component accepted as compatible and one isn't?