Boeing Boeing NMHG (Aerospace) (OP) 11 Jan 18 17:49 Is any one familiar with Boeing requirements? Can any one explain to me material substitution requirements? RE: Boeing IRstuff (Aerospace) 11 Jan 18 18:42 Seems to me that this is something you should discuss directly with Boeing. TTFN (ta ta for now) I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm RE: Boeing legrand01 (Mechanical) 24 Jan 18 20:05 Check this link: Boeing Approved Process Sources D1-4426 Link Specifically the "Approved Sources Flow Chart" and "User Instructions & Requirements" links. Hope that has some of the info you're looking for.