Boeing
All Processors must be approved and listed
in D1-4426 for those processes contracted.http://active.boeing.com/doingbiz/d14426/index.cfm
For additional supplier general provisions,
Go to: http://www.boeingsuppliers.com/idscommon/clauses/HXXX/H900_072412.pdf
H900, SECTION #26 – “MATERIAL SUBSTITUTION PROHIBITION”