摘要: This report develops revised establishment criteria for the Category II Instrument Landing System (ILS) with approach lights based upon benefit/cost analysis. Revised criteria require 2,500 or more annual instrument approaches by ... 展开 This report develops revised establishment criteria for the Category II Instrument Landing System (ILS) with approach lights based upon benefit/cost analysis. Revised criteria require 2,500 or more annual instrument approaches by certificated route air carrier aircraft. An existing Category II ILS at an airport recording fewer than 1,000 certificated route air carrier annual instrument approaches meets discontinuance criteria. Benefits of an ILS include reduction of flight disruptions--delays, diversions, and cancellations due to lowered published approach and landing minimums--and safety, the reduced probability of approach accidents. The primary impact of the criteria is to discourage future Category II ILS establishment at airports not served by trunk air carriers. In the short term, it is estimated that 25 airports now without a commissioned Category II ILS will qualify for a facility. Beyond the present time frame, only six additional airports are expected to qualify over the following ten years. (Author) 收起