National Transportation Safety Board

摘要

The National Transportation Safety Board has investigated 11 aircraft accidents— 10 involving apparent controlled flight into terrain (CFIT) and one involving a midair collision— that have caused serious concern about the effectiveness of the Federal Aviation Administration's (FAA) methods of ensuring that air traffic controllers detect and properly respond to imminently hazardous situations. The recommendations contained in this letter are intended to improve safety of flight through changes to the minimum safe altitude warning (MSAW) and conflict alert systems used to direct controller attention to CFIT hazards or impending collision and to FAA air traffic control (ATC) training.