Exactly David and well said, hope you are keeping well by the way.
The Boeing 767 and 777 also have the strake/vortex generator on the engine nacelle (top inboard), and it is known as the CHINE. Should this be missing then dispatch is allowed under the MEL/CDL but the penalty (provisos), is that you have to increase the VREF by several knots (obviously to avoid the unwanted separation that occurs at slow speeds with flaps extended).
Unfortunately I had an "out landing" with my Skygate Hawk (failsafe with turbine set to shutdown and gear set to extend), so I'm busy modifying and repairing the wheel well areas as the landing in the soft sand ripped everything off.
