Capt Claret,
The BCF I believe has been banned for quite sometime now for domestic use as it causes hole in the ozone layer and if there is one in an aircraft now then its beyond me. Sure its a good fire extinguishant but it can and will suck out the air which might cause difficulty in breathing for the user or the pilot is he/she uses it in the cockpit during a fire. Electrical fires are dangerous as it is and might complicate the problem if the pilot suddenly will be gasping for air because of the BCF and all he/she can inhale is the smoke from the electrical fire.
D6