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What is FISA? The Foreign Intelligence Surveillance Act, or âFISAâ, is the law that creates procedures for spying on foreign targets by our intelligence community. It allows organizations like the NSA, CIA, and FBI to gather intel by physical and electronic surveillance.
Definition. The Minimum Sector Altitude (MSA) is the lowest altitude which may be used which will provide a minimum clearance of 300 m (1 000 ft) above all objects located in the area contained within a sector of a circle of 46 km (25 NM) radius centred on a radio aid to navigation. (ICAO PANS-OPS/I-definitions).escription. Minimum sector altitudes or terminal arrival altitudes are established for each aerodrome and provide at least 300m (1 000 ft) obstacle clearance within 46 km (25 NM) of the navigation aid, initial approach fix, or intermediate fix associated with the approach procedure for that aerodrome.