The Safety Analysis and Risk Mitigation Process  Section 3  Hazard Severity Classification  Note: Severities related to ground-based effects apply to movement areas only.  Minimal  5  Minor  4  Major  3  Hazardous  2  Catastrophic 4 1  CONDITIONS RESULTING IN ANY ONE OF THE FOLLOWING: Flight Crew  Pilot is aware  of traffic  (identified by  Traffic Collision  Avoidance  System traffic  alert, issued by  ATC, or  observed by  flight crew) in  close enough  proximity to  require  focused  attention, but  no action is  required  Pilot deviation 9 where loss of  airborne  separation falls  within the  same  parameters of  a Proximity  Event or  measure of  compliance  greater than or  equal to 66  percent  Circumstances  requiring a  flight crew to  initiate a  go-around  Pilot deviation where  loss of airborne  separation falls  within the same  parameters of a low  Risk Analysis Event  severity  Reduction of  functional capability  of aircraft, but overall  safety not affected  (e.g., normal  procedures as per  Airplane Flight  Manuals)  Circumstances  requiring a flight crew  to abort takeoff  (rejected takeoff);  however, the act of  aborting takeoff does  not degrade the  aircraft performance  capability  Near mid-air collision  encounters with  separation greater  than 500 feet 10 Pilot deviation where  loss of airborne  separation falls within  the same parameters  of a medium Risk  Analysis Event  severity  Reduction in safety  margin or functional  capability of the  aircraft, requiring  crew to follow  abnormal procedures  as per Airplane Flight  Manuals  Circumstances  requiring a flight crew  to reject landing (i.e.,  balked landing) at or  near the runway  threshold  Circumstances  requiring a flight crew  to abort takeoff (i.e.,  rejected takeoff); the  act of aborting takeoff  degrades the aircraft  performance  capability  Near mid-air collision  encounters with  separation less than  500 feet 10 Pilot deviation where  loss of airborne  separation falls within  the same parameters  of a high Risk  Analysis Event  severity  Reduction in safety  margin and functional  capability of the  aircraft requiring crew  to follow emergency  procedures as per  Airplane Flight  Manuals  Near mid-air collision  encounters with  separation less than  100 feet 10 Ground collision  Mid-air collision  Controlled flight into  terrain or obstacles  Hull loss to manned  aircraft  Failure conditions  that would prevent  continued safe flight  and landing  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. 1. Refer to the current version of  FAA Order 7050.1,  Runway Safety Program . 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. 41 3.5_SMSM_201904  Originally published April 2019  Uncontrolled copy when downloaded