The FAA proposes to adopt a new airworthiness directive AD for all ATRGIE Avions de Transport Rgional Model ATR42 and ATR72 airplanes. This proposed AD was prompted by a report of a manufacturing defect identified in the lavatory fire extinguisher. This defect could potentially result in leakage at the eutectic tip leading to a loss of pressure in the cylinder making fire extinguishing capabilities ineffective. This proposed AD would require an inspection