The following is an example of how to operate the intercom. You are on the signal bridge at the 24MC transmitter (fig. 4-13), and you want to call conn. First, you push the selector button marked CONN on the designation plate. We will assume the line is clear for your message, which means that a steady red light appears over the signal bridge selector button at the conn transmitter. When the operator at conn pushes the signal bridge button, the signal lights at both stations begin to flash. Now you can operate the PRESS-TO-TALK switch and start your message. Any other station attempting to cut in gets the flashing busy signal. 4-15 CIRCUIT SYSTEM CIRCUIT SYSTEM 1MC General 35MC Launcher captains’ 2MC Propulsion plant 39MC Cargo handling 3MC Aviators 40MC Flag administration 4MC Damage control 42MC CIC coordinating 5MC Flight deck 43MC Unassigned 6MC Intership 44MC Instrumentation space 7MC Submarine control 45MC Research operations 8MC Troop administration and control 46MC Aviation ordnance and missile handling 9MC Underwater troop communication 47MC Torpedo control 18MC Bridge 49MC Unassigned 19MC Aviation Control 50MC Integrated operational intelligence center 21MC Captain’s command 51MC Aircraft maintenance and handling control 22MC Electronic control 52MC Unassigned 23MC Electrical control 53MC Ship administration 24MC Flag command 54MC Repair officer’s control 26MC Machinery control 55MC Sonar service 27MC Sonar and radar control 56MC Unassigned 29MC Sonar control and information 57MC Unassigned 30MC Special weapons 58MC Hangar deck damage control 31MC Escape truck 59MC SAMID alert 32MC Weapons control Table 4-2.—Shipboard Announcing Systems Student Notes: