§ 4.5   Definitions of outage, special offices and facilities, and 911 special
facilities.

   (a) Outage is defined as a significant degradation in the ability of an
   end user to establish and maintain a channel of communications as a
   result of failure or degradation in the performance of a communications
   provider's network.

   (b) Special offices and facilities are defined as entities enrolled in
   the Telecommunications Service Priority (TSP) Program at priority
   Levels 1 and 2, which may include, but are not limited to, major
   military installations, key government facilities, nuclear power
   plants, and those airports that are listed as current primary (PR)
   airports in the FAA's National Plan of Integrated Airports Systems
   (NPIAS) (as issued at least one calendar year prior to the outage).

   (c) A critical communications outage that potentially affects an
   airport is defined as an outage that:

   (1) Disrupts 50 percent or more of the air traffic control links or
   other FAA communications links to any airport;

   (2) Has caused an Air Route Traffic Control Center (ARTCC) or airport
   to lose its radar;

   (3) Causes a loss of both primary and backup facilities at any ARTCC or
   airport;

   (4) Affects an ARTCC or airport that is deemed important by the FAA as
   indicated by FAA inquiry to the provider's management personnel; or

   (5) Has affected any ARTCC or airport and that has received any media
   attention of which the communications provider's reporting personnel
   are aware.

   (d) [Reserved]

   (e) An outage that potentially affects a 911 special facility occurs
   whenever:

   (1) There is a loss of communications to PSAP(s) potentially affecting
   at least 900,000 user-minutes and: The failure is neither at the
   PSAP(s) nor on the premises of the PSAP(s); no reroute for all end
   users was available; and the outage lasts 30 minutes or more; or

   (2) There is a loss of 911 call processing capabilities in one or more
   E-911 tandems/selective routers for at least 30 minutes duration; or

   (3) One or more end-office or MSC switches or host/remote clusters is
   isolated from 911 service for at least 30 minutes and potentially
   affects at least 900,000 user-minutes; or

   (4) There is a loss of ANI/ALI (associated name and location
   information) and/or a failure of location determination equipment,
   including Phase II equipment, for at least 30 minutes and potentially
   affecting at least 900,000 user-minutes (provided that the ANI/ALI or
   location determination equipment was then currently deployed and in
   use, and the failure is neither at the PSAP(s) or on the premises of
   the PSAP(s)).

   [ 69 FR 70338 , Dec. 3, 2004, as amended at  81 FR 45067 , July 12, 2016]

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