CFR›Title 40›Chapter I›Part 1042›Subpart E ContainsSection 1042.401CorpusDaily eCFRDisplayed edition2026-09-17Last updated2026-09-17 Subpart E—In-use Testing Sections 1042.401 § 1042.401 General Provisions. Previous D Subpart D—Testing Production-line Engines Next F Subpart F—Test Procedures