(a) An instrument is deemed filed at the actual date and time at which the instrument is received by the National Vessel Documentation Center, except as provided in paragraph (b) of this section. Any materials submitted to supplement an instrument after the instrument is filed are deemed part of the original filing and relate back to the date and time of that filing.

(b) If filing of an instrument is subject to termination in accordance with § 67.217(a) and a new instrument is filed as a substitute for the original instrument, the filing of the original instrument will be terminated in accordance with § 67.217(c) and the substitute instrument will be considered a new filing. The substitute instrument will be deemed filed at the actual time and date it is received by the National Vessel Documentation Center.