world's two most competent aviation authorities
Or, "two of the worlds most competent aviation authorities..."
....... aviation authorities seem pretty clear that you should be using one.
... And, as specifically mentioned, an
approved one, at that.
This, and:
Expanded checklists are not permitted.
...really should be enough to remind pilots to do away with the multi page essays from non approved sources, and stick to what the manufacturer provides for the aircraft.
Thanks for the research G!