Final configuration:
function clbk_prestep(simt,simdt,mjd)
if vi:get_groundcontact() == true and vi:get_attachmentstatus(Attach0) == nil and vi:get_attachmentstatus(Attach1) == nil then
vi:del_animation(anim_Chute)
end
end
function clbk_poststep(simt,simdt,mjd)
if...