▁part ▁to ▁the ▁functional ▁requirements ▁of ▁that ▁part ▁when ▁installed . ▁ ▁Compar ative ▁Analysis ▁comp ares ▁the ▁function ▁of ▁the ▁proposed ▁part ▁to ▁the ▁O A H ▁part . ▁ ▁As ▁an ▁example : ▁ ▁If ▁a ▁P MA ▁application ▁for ▁flight ▁control ▁c ables ▁were ▁to ▁show ▁that ▁the ▁P MA ▁part ▁exceed s ▁the ▁pull ▁strength ▁requirements ▁of ▁the ▁aircraft ▁system ▁it ▁is ▁meant ▁for , ▁that ▁is ▁general ▁analysis . ▁ ▁To ▁show ▁that ▁it ▁exceed s ▁that ▁of ▁the ▁O A H ▁part ▁is ▁compar ative ▁analysis . ▁ ▁The ▁modern ▁tr end ▁is ▁to ▁use ▁a ▁variety ▁of ▁techniques ▁in ▁combination ▁in ▁order ▁to ▁obtain ▁appro val ▁of ▁complicated ▁parts ▁- ▁re lying ▁on ▁the ▁techniques ▁that ▁are ▁most ▁accurate ▁and ▁best ▁able ▁to ▁provide ▁the ▁proof ▁of ▁air worth iness ▁desired . ▁ ▁The ▁cogn iz ant ▁regional ▁F AA ▁A ircraft ▁Cert ification ▁Office ▁( AC O ) ▁determ ines ▁if ▁the ▁applic ant ▁has ▁shown ▁comp liance ▁with ▁all ▁relevant ▁air worth iness ▁reg ulations ▁and ▁is ▁thus ▁entitled ▁to ▁design ▁appro val . ▁ ▁The ▁second ▁step ▁in ▁the ▁application ▁process ▁is ▁to ▁apply ▁to ▁the ▁F AA ▁Man ufact uring ▁In spe ction ▁Div is ional ▁Office ▁( M ID O ) ▁to ▁obtain ▁appro val ▁of ▁the ▁manufact uring ▁quality ▁ass urance ▁system ▁( known ▁as ▁production ▁appro val ). ▁ ▁Production ▁appro val ▁will ▁be ▁granted ▁when ▁the ▁F AA ▁is ▁satisfied ▁that ▁the ▁system ▁will ▁not ▁permit ▁parts ▁to