Here's another goof from the Pratt web site.?

Question

"The PW1000G engine uses a state-of-the-art gear system allows the engine’s fan to operate at a different speed than the low-pressure compressor and turbine."

Answer 1

Yes, the word 'that' is missing after 'system'.  Well, shows you that there are no more proofreaders in this world.  

Answer 2

I hate reading materials with such fundamental mistakes.  You would think that someone would pass it over in review just to find such errors before allowing it to be published.  On the other hand, we all make mistakes.  I guess I find it annoying because it shows that the publishers do not care enough about the reader to even bother to give them something that is written properly.