▁leave ▁the ▁system ▁until ▁the ▁parts ▁have ▁been ▁verified ▁to ▁meet ▁the ▁requirements ▁of ▁the ▁approved ▁design , ▁and ▁the ▁system ▁otherwise ▁meets ▁the ▁requirements ▁of ▁the ▁F AA ▁quality ▁system ▁reg ulations . ▁ ▁A ▁Production ▁Appro val ▁H older ▁( PA H ) ▁will ▁typically ▁already ▁have ▁satisfied ▁this ▁requirement ▁before ▁P MA ▁application ▁is ▁made . ▁ ▁P MA ▁applications ▁based ▁upon ▁lic ensure ▁or ▁ST C ▁do ▁not ▁require ▁A CO ▁appro val ▁( since ▁the ▁data ▁has ▁already ▁been ▁approved ) ▁and ▁can ▁go ▁straight ▁to ▁the ▁M ID O . ▁ ▁History ▁ ▁Under ▁the ▁Civil ▁Air ▁Reg ulations ▁( C AR s ), ▁the ▁government ▁had ▁the ▁authority ▁to ▁appro ve ▁aircraft ▁parts ▁in ▁a ▁prede cess or ▁to ▁the ▁P MA ▁rules . ▁ ▁This ▁authority ▁was ▁found ▁in ▁each ▁of ▁the ▁sets ▁of ▁air worth iness ▁standards ▁published ▁in ▁the ▁Civil ▁Air ▁Reg ulations . ▁ ▁C AR ▁ 3 . 3 1 , ▁for ▁example , ▁permitted ▁the ▁Administr ator ▁to ▁appro ve ▁aircraft ▁parts ▁as ▁early ▁as ▁ 1 9 4 7 . ▁ ▁In ▁ 1 9 5 2 , ▁the ▁Civil ▁Aer onaut ics ▁Board ▁adjust ed ▁the ▁location ▁of ▁the ▁parts ▁production ▁authority ▁from ▁the ▁". 3 1 " ▁reg ulations ▁to ▁the ▁". 1 8 " ▁reg ulations . ▁ ▁For ▁example , ▁the ▁C AR ▁ 3 ▁authority ▁for ▁modification ▁and ▁replacement ▁parts ▁could ▁be ▁found ▁in ▁section ▁ 3 . 1 8 ▁after ▁ 1 9