ﺑﻬﺮﻩﺑﺮﺩﺍﺭی ﺍﺿﻄﺮﺍﺭی Emergency operation ﺑﻬﺮﻩﺑﺮﺩﺍﺭی ﺍﺯ ﯾﮏ ﺳﯿﺴﺘﻢ ﺩﺭ ﻣﻮﺍﻗﻊ ﻏﯿﺮ ﻋﺎﺩی و ﺍﺗﻔﺎﻗﯽ.