Now there is evidence of repair facilities hiring low-wage mechanics who can't read English.

Twenty-one people were killed when U.S. Airways Express Flight 5481 crashed in Charlotte, North Carolina in 2003. The plane went wildly out of control on takeoff.

One reason for the crash, investigators found, was that mechanics incorrectly connected the cables to some of the plane's control surfaces in the repair shop. The FAA was cited for improper oversight of the repair process.