ABSTRACT
This chapter describes the many types of systems and equipment used for passenger safety, convenience and entertainment. Passenger transport and business aircraft are fitted with a range of cabin systems and equipment for passenger safety, convenience and entertainment. Audio systems include the passenger address system used by the flight or cabin crew to give out safety announcements and other flight information. The passenger address (PA) system is primarily a safety system that provides passengers with voice announcements and chime signals from the flight or cabin crew; its secondary purpose is for the audio entertainment system. The PA amplifier provides a level of sidetone to the crew's handset or headsets during voice announcements. Passengers can obtain real-time flight information on a video channel at their seat position or on cabin video screens via moving-map systems. A positive pressure relief valve opens in the event of excessive pressure in the cabin; this protects the aircraft structure from excessive loading.
