14 C.F.R. § 21.15
Application for type certificate
(a) An application for a type certificate is made on a form and in a manner prescribed by the FAA.
(b) An application for an aircraft type certificate must be accompanied by a three-view drawing of that aircraft and available preliminary basic data.
(c) An application for an aircraft engine type certificate must be accompanied by a description of the engine design features, the engine operating characteristics, and the proposed engine operating limitations.