20 CFR § 682.302 - Under what circumstances must rapid response services be delivered?
Rapid response must be delivered when one or more of the following circumstances occur:
(a) Announcement or notification of a permanent closure, regardless of the number of workers affected;
(b) Announcement or notification of a mass layoff as defined in § 682.305;
(c) A mass job dislocation resulting from a natural or other disaster; or
(d) The filing of a Trade Adjustment Assistance (TAA) petition.