This Aerospace Recommended Practice provides criteria for design and location of power supplies@ controls@ light fixtures@ and associated equipment which are used to provide emergency illumination in transport aircraft. PURPOSE Definition: Emergency illumination is that illumination which is required when normal illumination is unavailable. Emergency illumination must be adequate to permit aircraft occupants to locate@ proceed to operate@ and use cabin exits@ both normal and emergency@ escape slides@ life jackets@ life rafts@ and special survival equipment.