14 CFR § 135.295 - Initial and recurrent flight attendant crewmember testing requirements.
No certificate holder may use a flight attendant crewmember, nor may any person serve as a flight attendant crewmember unless, since the beginning of the 12th calendar month before that service, the certificate holder has determined by appropriate initial and recurrent testing that the person is knowledgeable and competent in the following areas as appropriate to assigned duties and responsibilities -
(a) Authority of the pilot in command;
(d) Briefing of passengers;
(e) Location and operation of portable fire extinguishers and other items of emergency equipment;
(f) Proper use of cabin equipment and controls;
(g) Location and operation of passenger oxygen equipment;
(h) Location and operation of all normal and emergency exits, including evacuation chutes and escape ropes; and