14 CFR · Part 33
14 CFR § 33.90
Initial maintenance inspection test.
Each applicant, except an applicant for an engine being type certificated through amendment of an existing type certificate or through supplemental type certification procedures, must complete one of the following tests on an engine that substantially conforms to the type design to establish when the initial maintenance inspection is required:
An approved engine test that simulates the conditions in which the engine is expected to operate in service, including typical start-stop cycles.
An approved engine test conducted in accordance with § 33.201 (c) through (f).
Regulations Referenced
Reflects the eCFR edition current as of September 29, 2026. Retrieved from ecfr.gov on October 16, 2026.
Primary Source