CFR›Title 45›Subtitle A›Part 81›Subpart D ContainsSections 81.31–81.36CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Subpart D—Form, Execution, Service and Filing of Documents Sections 81.31 § 81.31 Form of documents to be filed. 81.32 § 81.32 Signature of documents. 81.33 § 81.33 Filing and service. 81.34 § 81.34 Service—how made. 81.35 § 81.35 Date of service. 81.36 § 81.36 Certificate of service. Previous C Subpart C—Parties Next E Subpart E—Time