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1. Refer to the current version of FAA Order 7050.1, Runway Safety Program . 

2. Proximity Events and Operational Deviations are no longer used to measure losses of separation, but they are applicable when validating old data. The minimal loss of standard separation is now represented as a measure of compliance of greater than or equal to 66 percent. 

3. Risk Analysis Event severity indicators are as follows: 

a. Proximity. Failure transition point of 50 percent of required separation or less. 

b. Rate of Closure.  Failure transition point greater than 205 knots or 2,000 feet per minute (consider both aspects and utilize the higher of the two if only one lies above the transition point). 

c. ATC Mitigation. ATC able to implement separation actions in a timely manner. 

