§  1.718   Unsatisfied informal complaints; formal complaints relating back to
the filing dates of informal complaints.

   When an informal complaint has not been satisfied pursuant to § 1.717,
   the complainant may file a formal complaint with this Commission in the
   form specified in § 1.721. Such filing will be deemed to relate back to
   the filing date of the informal complaint: Provided, That the formal
   complaint: Is filed within 6 months from the date of the carrier's
   response, or if no response has been filed, within 6 months of the due
   date for the response; makes reference to the date of the informal
   complaint, and is based on the same cause of action as the informal
   complaint. If no formal complaint is filed within the 6-month period,
   the informal complaint proceeding will be closed.

   [ 83 FR 44831 , Sept. 4, 2018]