CFR›Title 14›Chapter I›Part 34›Subpart E ContainsSection 34.48CorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 Subpart E—Certification Provisions Sections 34.48 § 34.48 Derivative engines for emissions certification purposes. Previous D Subpart D—Exhaust Emissions (In-use Aircraft Gas Turbine Engines) Next G Subpart G—Test Procedures for Engine Exhaust Gaseous Emissions (Aircraft and Aircraft Gas Turbine Engines)