How can I flight instruct with only a 3rd class medical (thats all I can get right now)? Had a friend tell me I can still instruct if I don't charge, or use my airplane and charge more for that and not charge for the instruction, but I don't see anything in the regs about this. As far as I can tell all I can do is bfr if the pilot is current, instrament in vfr, and any training that someone would need for insurance (buying a plane that the insurance requires instruction for but they are rated). Am I missing something? I would love to do more but don't want to bust a reg.