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F-1
APPENDIX F
Risk Criteria Used by the FAA
Although the main objective of this research was to de- determining severity. Table F1 provides the FAA specific def-
velop a tool to help airport planners evaluate RSA alterna- initions of severity.
tives, the basis for the analysis was a quantitative assessment Likelihood is an expression of how often an event can be ex-
of risk associated with runway excursions and undershoots. pected to occur at the worst credible severity. Table F2 shows
Risk is the composite of the likelihood of the occurrence FAA likelihood definitions. A risk classification (high, medium,
and severity of the outcome or effect (harm) of the hazard. or low) is provided based on the FAA risk matrix shown in
Severity is the measure of how bad the results of an event are Figure F1 and the likelihood and severity scenario for each
predicted to be. Likelihood should be considered only after hazard.
Table F1. FAA severity definitions (FAA 2010).
Hazard Severity Classification
Minimal Minor Major Hazardous Catastrophic
5 4 3 2 1
No damage to - Minimal damage - Major damager to - Severe damage to - Complete loss of
aircraft but to aircraft; aircraft and/or aircraft and/or aircraft and/or
minimal injury or - Minor injury to minor injury to serious injury to facilities or fatal
discomfort of little passengers; passenger(s)/ passenger(s)/ injury in
consequence to - Minimal worker(s); worker(s); passenger(s)/wor
passenger(s) or unplanned airport - Major unplanned - Complete ker(s);
workers operations disruption to unplanned airport - Complete
limitations (i.e. airport closure; unplanned airport
taxiway closure); operations; - Major unplanned closure and
- Minor incident - Serious incident; operations destruction of
involving the use - Deduction on the limitations (i.e. critical facilities;
of airport airport's ability to runway closure); - Airport facilities
emergency deal with adverse - Major airport and equipment
procedures conditions damage to destroyed
equipment and
facilities-
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F-2
Table F2. FAA likelihood levels (FAA 2010).
ATC Operational
General Airport Specific
Per Facility3 NAS-wide4
Probability of Expected to occur Expected to occur Expected to occur
occurrence per more than once per more than once per every 1-2 days
Frequent
operation is equal week or every week
A
to or greater than 2500 departures
1x10-3 (4x10-4), whichever
occurs sooner
Probability of Expected to occur Expected to occur Expected to occur
occurrence per about once every about once every several times per
Probable
operation is less month or 250,000 month month
B
than 1x10-3, but departures (4x10-6),
equal to or greater whichever occurs
than 1x10-5 sooner
Probability of Expected to occur Expected to occur Expected to occur
occurrence per about once every about once every 1 about once every
Remote
operation is less year or 2.5 million -10 years few months
C
than 1x10-5 but departures (4x10-7),
equal to or greater whichever occurs
than 1x10-7 sooner
Probability of Expected to occur Expected to occur Expected to occur
Extremely
occurrence per once every 10-100 about once every about once every 3
Remote
operation is less years or 25 million 10-100 years years
D
than 1x10-7 but departures (4x10-8),
equal to or greater whichever occurs
than 1x10-9 sooner
Probability of Expected to occur Expected to occur Expected to occur
Improbable
Extremely
occurrence per less than every 100 less than once less than once
operation is less years every 100 years every 30 years
E
than 1x10-9
Note: Occurrence is defined per movement.
Figure F1. FAA risk matrix (FAA 1988, 2010).
