Point of order.... HSBC has been running an ad for the last year which you might want to consider...
I travel a lot, and with rare exception, most of the people I come in contact with overseas are able to read English. All of my work colleagues were learning English no later than middle school, and most seem to start in elementary school. The US is one of the few countries left where being monolingual is the norm instead of the exception.
I'm quite sure there are examples where someone found a tech who couldn't speak English, but reading English and speaking it are mutually exclusive. I've got co-workers who can read and write English as though they were straight out of Oxford or Cambridge. But I cringe whenever I have to have a verbal conversation with them because it's impossible to hear thru the accent or because they're very self-conscious about speaking or listening in English, whereas reading or writing it is no problem because they get unlimited do-overs...
I also think it's safe to say that not everyone who has the urge to seek out a job repairing complex machinery is a middle school or high school dropout, because that would also have to extend to those born here who had the same urge.
None of that is intended to minimize the legitimate safety and oversight issues with offshoring, but I think the whole "they can't understand the manuals" argument is really overstated and nowhere near the problem some make it out to be. It probably also detracts a bit from the bigger issues which are oversight and licensing.