I think they usually buy authentic parts through foreign corporations, but I'm sure there are a couple of "quick fixes" with local parts. Those 747SPs are the funniest lookin' things...
Parts illegally salvaged from crashes, counterfeit parts and other substandard components regularly find their way into the world's air fleets, sold at bargain prices, often with falsified documents about their origin or composition.
For the flying public, they are a growing peril.
"The whole system is contaminated,'' said Peter Friedman, director of quality at an aircraft repair station in Oakland, Calif. "In my position, I find unapproved parts on a daily basis.''
"Unapproved parts'' is the Federal Aviation Administration's term for components not certified as airworthy - from fraudulently produced knockoffs made from inadequate alloys to recycled pieces misrepresented to hide defects, age or crash damage.
In the industry, they are known as "bogus parts.'' For people with no qualms about putting the flying public at risk, it's a lucrative market. The worldwide aircraft parts inventory is worth $45 billion.
snipped from:
http://www.lubbockonline.com/news/120896/plane.htm