Aviate - fly the aircraft, a bit obvious
Navigate - fly the aircraft; engine out procedure, initiate level off/decent as required
Communicate - initial mayday call and standby
These steps can take place very quickly.
Go back to the top
Aviate - assess, recall actions or checklists
Navigate - confirm EOP, decent altitude, off airway tracking
Communicate - tell everyone what you're doing
Any changes in the status of the aircraft i.e. a fire gone out, go back to the top as priorities will change
Aviate, navigate, communicate
This would seem to work in all senarios