Timelord. I note that RA 2340 list the aircrew categories and states,
"Supernumerary Crew. A Supernumerary Crewmember is an individual, military or civilian, who is employed on an Air System and authorized to carry out a specific duty (that does not require an Aircrew qualification) while in flight or ground taxiing. This specific duty is to have an active role in achieving the purpose of the authorized flight and may involve the operation of Air System equipment/systems or authorized Equipment Not Basic to the Air System (ENBAS)2 under the supervision of the Air System’s Aircrew."
I am sure that the coroner will determine if Cpl Bayliss had undergone the necessary training for the authorized flight.
DV