A PASSENGER CONTROL UNIT, WHICH IS A MULTI-FUNCTION CONTROL UNIT FOR PASSENGER USE IN IN-FLIGHT SYSTEMS IN CIVIL AIRCRAFT. IT CONNECTS TO A SEAT ELECTRONICS BOX (SEB) AND COVERS ONE PASSENGER SEAT GROUP. THE DATA LINES COMMUNICATION IS BY A 1.5 Mb/s LOW SPEED USB SERIAL COMMUNICATION. IT CAN EITHER RECEIVE OR SEND MESSAGES TO/FROM THE SEB. THE SEB SENDS MESSAGES TO THE UNITS HANDSET TO CONTROL ITS AUDIO-VISUAL DEVICES (DISPLAYS, LINDICATOR LIGHTS, ETC). THE UNITS HANDSET SENDS ITS KEY SWITCH OPERATION AND STATUS TO THE SEB.

CLASSIFICATION IS DETERMINED ACCORDING TO THE GENERAL INTERPRETATIVE RULES 1 AND 6.