3 of us taking turns at doing some 1179 training with instructor.
New this was going to happen because of the way the checklist was written.
Instructor fails right engine, student idents dead eng. , pulls the throttle to confirm, feathers and mixture, eng. stops then rushes on with rest of checks from checklist, switching mags off killing the live engine! aircraft yaws.
Realises mistake switches mags on, engine made some interesting noises.
I,ve always taught once the aircraft has been CONTROLLED, the dead engine has been CONFIRMED and the problem CONTAINED then unless a fire is burning the wing off DON'T touch anything until you have double checked and re confirmed which engine you have shut down.
If necessary rewrite checklist so that there is a pause after mixture ICO.
Saves a lot of embarrasment (and lives).