What a terrible situation to get stuck in! Your colleague`s main engine (heart) fails when at cruising altitude, and suddenly you`re in charge of the way things are going to happen in the very near future
. You`ve probably been drillied in the sim and through company SOPs on what to do and how to do it, but these things happen rarely (you`re more likely to encounter an engine failure) and they are never the same.
Aviate, navigate, communicate... These things have been correctly mentioned. But it is also very important to assess your new world before doing anything. No contact with the guy next to you? He`s not sleeping? Unconscious? Maybe/maybe not...
. First thing to do, just to get things started, is call "my controls". If you can secure your colleague by the seatbelt/harness lock then you should have him slumping down/forwards on the control column - which you now are in control of. Then, call the CC for assistance. While he/she/they are coming, call ATC and divert to nearest possible airport for a priority landing. Now you`ve effectively used very many of your options for help and can focus on flying the bird you`re in charge of
. Unless you`re a doctor or have sufficient medical training, there is really no way of finding out exactly what is wrong with your colleague, but if you`re doing nothing (or your best) to help him then you`re doing something wrong.
But this is why air transport aircraft have a minimum of 2 flight deck crew onboard. Also, those who fly single pilot commerciallly over a certain age are required to have their medical at shorter intervals than those flying multipilot.
Also, this is where an FO with experience is preferable
