| http://www.w3.org/ns/prov#value | - As a sidenote, In 2010 the NTSB revised their regulatory requirement that an operator involved in a Traffic Collision Avoidance System (TCAS) advisory must report that event to the NTSB. Essentially, if a pilot is given information by the onboard TCAS system to take evasive action, that event must be reported to the NTSB. They are accumulating the data to see if there is a problem or trend.
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