This ARP 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@ designed to FAR 25 for operation under FAR 91 and FAR 121. It is not the purpose of ARP to specify design methods to be followed in the accomplishment of the stated objectives. PURPOSE Definition: Emergency illumination is that illumination which is provided when normal illumination is unavailable. Emergency illumination should be adequate to permit aircraft occupants to locate@ proceed to operate@ and use cabin emergency exits@ escape slides@ life jackets@ life rafts@ slide rafts and special survival equipment.