A Pilot incapacitation can be either overt or subtle.
In order to diagnose the second some airlines have adopted the following:
If the other crew member does not answer any of three calls after he made a deviation from a SOP
or only once if his behavior has affected the safety of the flight, his subtle incapacitation can be assumed.
And then the other pilot has to declare: "Emergency athority! I have control!"
Learn from John Wayne:
The High and the Mighty Promo - IMDb
And let's hope and pray that this ends the series:
http://www.pprune.org/rumours-news/5...nt-around.html