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A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music.
Preventive maintenance checks and services (PMCS) in the United States Army or preventive maintenance inspections (PMI) in the United States Air Force are the checks, services, and maintenance performed before, during, and after any type of movement or before the use of all types of military equipment.
1 Main Circuit (1MC) is the term for the shipboard public address circuits on United States Navy and United States Coast Guard 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 (normally) able to hear it.
Integrated vehicle health management (IVHM) or integrated system health management (ISHM) is the unified capability of systems to assess the current or future state of the member system health and integrate that picture of system health within a framework of available resources and operational demand. [1]
1MC – 1 Main Circuit, shipboard public address system; 2MC – 2 Main Circuit, same as 1MC, but limited to the engine room; 3M – Maintenance and Material Management (3M System) 3MA – Maintenance and Material Management Assistant; 3MC – Maintenance and Material Management Coordinator; 3MI – Maintenance and Material Management Inspection
Charged with those logistics support functions that address on-orbit maintenance, support data and documentation, logistics information systems, maintenance data collection and maintenance analysis. The OSO is also responsible for mechanical systems—such as those used to attach new modules or truss sections to the vehicle during assembly.
Vehicular communication systems are computer networks in which vehicles and roadside units are the communicating nodes, providing each other with information, such as safety warnings and traffic information. They can be effective in avoiding accidents and traffic congestion.
The basic idea of the system was inspired by the existing address system used in many towns where streets and avenues are numbered outwards from a starting "main street" near the center of town. To number rural section line roads in the state the rough geographical centerlines of the state were designated as "Main Street" (running east–west ...