Gary
Hello Jay and Tom
The USA and UK are two countries separated by one language - English -
and the ne'er the twain shall meet ;-())))Avoiding the use of the apostrophe is one thing we should consider. It does help users whose mother tongue is not English because the grammar rules for the apostrophe are difficult to understand with the possessive apostrophe being the hardest. Comes from personal experience of working in several non-English countries. Also, if you work in the aviation industry and use Simplified English, the apostrophe is definitely out.
Out of curiosity, just why is the apostrophe banned from the aviation industry? Is its use a real risk to safety?
I have held an FAA Airframe & Powerplant (A&P) Mechanic's certificate since the 1980s and have been a licensed pilot since 1971 and was unaware of any aviation dangers attributed to apostrophes--up to now.
Gary
My guess is that non-native speakers more easily could misunderstand the contraction particularly when quickly scanning a document. The only contraction I can think of is you're for you are vs your.
An very common adage in safety is to make the instructions very clear and precise and avoid any wording/phrasing/contractions/etc that could cause confusion. This is especially important when there is a problem and quick/accurate comprehension is critical.