Risk Assessment Method to Support Modification of Airfield Separation Standards

This report provides a methodology that airports can use to support their request for modification of standards. It is intended to be used in those circumstances where the design criteria for separations between taxiways/taxilanes and (1) other taxiways/taxilanes and (2) fixed or movable objects as well as separations between taxiways and runways cannot be met. This risk-based methodology will be useful to airport staff and their consultants as they assess the risks associated with non-standard separations at existing constrained airports where the standards can't be practicably met.