CFR > Title 14 - Aeronautics and Space > CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION > SUBCHAPTER C—AIRCRAFT (parts 21 to 50) > PART 33—AIRWORTHINESS STANDARDS: AIRCRAFT ENGINES > SUBPART F—Block Tests; Turbine Aircraft Engines (§33.81 to §33.99) > 33.81—Applicability.