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1 Main Circuit (1MC) is the term for the shipboard public address circuits on United States Navy vessels. This provides a means of transmitting general information and orders to all internal ship spaces and topside areas, and is loud enough that all embarked personnel are able to (normally) hear it. It is used to put out general information to the ship’s crew on a regular basis each day. The system consists of an amplifier-oscillator group which is located in the IC/gyro room, a microphone control station, portable microphones at each control station and loudspeakers located throughout the ship. Control stations for the 1MC announcing system are located at the pilot house, OOD stations on the quarterdecks, after steering and Damage Control Central area.〔NAVEDTRA 14325 p.4-14〕 During an incident involving a casualty, the 1MC is a communication tool used by DCA (damage control assistant) to keep ship members alerted and informed of casualty location area, status, and incident response efforts by the DC organization. The 1MC is divided into smaller sub-circuits, such as officer's quarters and topside. At the option of the officer of the deck, some details are not passed on certain circuits.〔 The 1MC is also used for transmitting various alarm sounds to alert the crew of specific impending dangers such as an inbound anti-ship missile, chemical attack, collision, or a flight deck crash. ==Other circuits== * 2MC: Propulsion plant〔NAVEDTRA 14325 p.4-15〕 * 3MC: Aviators〔 * 4MC: Damage control〔 * 5MC: Flight deck〔 * 6MC: Intership〔 * 7MC: Submarine control〔 * 8MC: Troop administration and control〔 * 9MC: Underwater troop communication〔 * 10MC: Well Deck * 18MC: Bridge〔 * 19MC: Aviation control * 21MC: Captain's command〔 * 22MC: Electronic control〔 * 23MC: Electrical control〔 * 24MC: Flag command〔 * 26MC: Machinery control〔 * 27MC: Sonar and radar control〔 * 29MC: Sonar control and information〔 * 30MC: Special weapons〔 * 31MC: Escape trunk〔 * 32MC: Weapons control〔 * 35MC: Launcher captains〔 * 39MC: Cargo handling〔 * 40MC: Flag administrative〔 * 42MC: CIC coordinating〔 * 44MC: Instrumentation space〔 * 45MC: Research operations〔 * 46MC: Aviation ordnance and missile handling〔 * 47MC: Torpedo control〔 * 50MC: Integrated operational intelligence center〔 * 51MC: Aircraft maintenance and handling control〔 * 53MC: Ship administrative〔 * 54MC: Repair officer's control〔 * 55MC: Sonar service〔 * 58MC: Hangar-deck damage control〔 * 59MC: SAMID alert〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「1MC」の詳細全文を読む スポンサード リンク
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