A Pax in an RAF FJ aircraft should not be placed under a "G" loading of 6.5 and the rules are explict on this. The limit is 2/3rds of the last value. Not many of the last Jag passengers managed to keep the contents of their stomach down, such being the nature of the forces and motions involved in flying a FJ to the inexperinced
However, it sounds like the yank Jock was purely out to break this bloke...