This Aerospace Recommended Practice (ARP) covers the general design and performance characteristics of illuminated information signs for service in the passenger compartment of passenger transport aircraft. "Illuminated information signs" are lighted signs used to inform occupants of the passenger compartment. Signs may use symbols or letters to convey messages. This ARP does not apply to "EXIT" signs which are the subject of ARP503.
This document is being revised to clarify sign uniformity,contrast ratio and LED requirements. This document only addresses Part 25 and Part 29 airplanes.