Byron Harris of WFAA-TV in Dallas, Texas offers "News 8 Investigates: Airline mechanics who can't read English" (link):

There are more than 236 FAA-certified aircraft repair stations in Texas, according to the FAA's Web site. News 8 has learned that hundreds of the mechanics working in those shops do not speak English and are unable to read repair manuals for today's sophisticated aircraft... Former FAA inspector Bill McNease told News 8 he regularly encountered applicants for pilots' licenses who tried to pretend they could speak English — but could not... News 8 discovered that mechanics at one licensing center in San Antonio were being tested in Spanish as late as last fall. The FAA ultimately shut the facility down... A certified mechanic can earn upwards of $25 an hour in Texas. Technicians who can't speak English are often hired for less than $10, according to mechanics interviewed by News 8...

More at the link. The FAA didn't want to be interviewed for his report.