Experts say fight the fire first, but in reality the average portable size fire extingisher isnt going to have much effect on 200 gallons of jet fuel.
The interesting question to ask is how many pruners have experienced a crash where fuel tank ruptured but their was no fire?
Usually if there is a fire it starts immediatley?
So do you prepare a casualty for extraction, but don't him move unless you suspect a fire will start?
Creaser