Sec.  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  Sec. 1.717, the
   complainant may file a formal complaint with this Commission in the form
   specified in  Sec. 1.721. Such filing will be deemed to relate back to the filing
   date of the informal complaint: Provided, That the formal complaint: (a) Is
   filed within 6 months from the date of the carrier's report, (b) makes
   reference to the date of the informal complaint, and (c) is based on the
   same cause of action as the informal complaint. If no formal complaint is
   filed within the 6-month period, the complainant will be deemed to have
   abandoned the unsatisfied informal complaint.

   [ 51 FR 16040 , Apr. 30, 1986]