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]

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                            formal complaints