Is it true that after the chickens are slaughtered, they are passed through suddenly shining flames for their feathers? If not, how is feather plucking done?

We perform the plucking of the chickens' feathers with feather plucking equipment that works with plastic fingers. Passing through the suddenly shining flame is solely aimed at removing the fine feathers that remain on the wings. This process is no different from how our mothers used to smoke the plucked chicken.