Sec.  18.117   Report of interference investigation.

   (a)  An interim report on investigations and corrective measures taken
   pursuant to  Sec. 18.115 of this part shall be filed with the EIC of the local
   FCC office within 30 days of notification of harmful interference. The final
   report shall be filed with the EIC within 60 days of notification.

   (b) The date for filing the final report may be extended by the Engineer in
   Charge when additional time is required to put into effect the corrective
   measures or to complete the investigation. The request for extension of time
   shall be accompanied by a progress report showing what has been accomplished
   to date.