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Class B TAWS is defined by the U.S. FAA as:A class of equipment that is defined in TSO-C151b and RTCA DO-161A. As a minimum, it will provide alerts for the following circumstances:
* Reduced required terrain clearance
* Imminent terrain impact
* Premature descent
* Excessive rates of descent
* Negative climb rate or altitude loss after takeoff
* Descent of the airplane to 500 feet above the

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