G'day 25F,
Dealing with pilot incapacitation is an event which is practiced every so often during cyclic simulator training in the airline I fly for so it should be handled competently if it ever happens.
Has it happened? As a matter fact yes, to me when I was an F/O. En-route from SYD to NRT the Captain returned from a rest break feeling off colour and was unable to resume his duties. He was suffering kidney stones.
I took over and we completed the flight to NRT which was about two hours away. An emergency was declared, Medlink was consulted and the ailing crewmwmber was looked after.
We were lucky enough to have a third pilot on the crew, due to the sector length, and he remained in the LHS for the rest of the flight.
It was a bit of an eye opener for him though, he'd never been to NRT before and the weather was right on chart minima, it was night time and his Captain had gone a pale green colour and was sitting in the observer's seat groaning and moaning.
On arrival the aircraft was met by airport medical staff and the Captain was examined and then passengered home the next day. He was treated back at home and has since resumed full duties.
After we got to the hotel the S/O and I hotfooted it to the "Truck", which sadly no longer operates.
Regards,
BH.