Hi!
I tried to insert the brake controller into the plane, it gave an error.

Мод Laser Tanks (2.0.4) вызвал неустранимую ошибку.
Пожалуйста, сообщите об этой ошибке автору мода.

Error while running event laser_tanks::on_player_placed_equipment (ID 42)
laser_tanks/00electric-vehicles-lib-reloaded/module.lua:108: attempt to index local 'entity' (a nil value)
stack traceback:
laser_tanks/00electric-vehicles-lib-reloaded/module.lua:108: in function 'update_equipment'
laser_tanks/00electric-vehicles-lib-reloaded/module.lua:310: in function <laser_tanks/00electric-vehicles-lib-reloaded/module.lua:308>

into a non-electric vehicle?

Exactly!
Is it possible to either prohibit inserting into inappropriate transport, or so that there is not an error, but a warning that this cannot be done :)