Hi Xpert11,
A lot of variables, regarding further explosions, i.e. type/size of aircraft, equipment carried on board etc,
3 things that are usually required are:
Fuel (anything flammable - oils, aviation fuel, alcohol, etc)
Heat (electrical sparks from the batteries, heat from the enginge)
Oxygen (to further fuel the fire)
If the power source (batteries has been switched off or removed, the likelihood is reduced.)
The first thing I would do after grabbing as much as I could carry (see my list above) is move to lower ground, (explosions generally go up or
outward!) until I felt it was safe to explore the wreckage further.
Generally 12-24 hours. (Batteries drained, fuel leakage evaporated)
It is advisable to stay in the vicinity of the aircraft, (unless in hostile territory of course!) because that is where they are going to start the
search area.
Hope that partially answers your question.
regards.