Aircraft commander = the senior crew memeber on board (Captain -> F.O. -> SCCM)
CRM = crew rescource management
All on board crew using their collegues to their full potential and ensuring good lines of communication are open at all times to ensure the safe opperation of a flight.
Catastrophic = A situation that imeadiately threatens the lives of everyone on board the A/C
Forgot to answer these - hope these are ok
