Development of Obstacle Clearance Criteria and Standards for MLS and MLS/RNAV Precision Approaches and Development of an MLS Collision Risk Model

To develop obstacle clearance criteria and standards for MLS procedures development, the accuracy with which an aircraft can be flown along a defined approach path must be determined. Error modeling, simulator tests, and flight tests are used to determine the distributions of the flight paths about the specified approach paths. Isoprobability contours are derived from which obstacle clearance criteria are developed. The error models are also used in developing a collision risk model for use in evaluating the cumulative risk of an aircraft collision with an obstacle for specified aircraft performance and obstacle environment.