Section 21.147 - Amendment of production certificates(a) A holder of a production certificate must apply for an amendment to a production certificate in a form and manner prescribed by the FAA.(b) An applicant for an amendment to a production certificate to add a type certificate or model, or both, must comply with §§ 21.135(c) , 21.137 , 21.138 , and 21.150 .(c) An applicant may apply to amend its production limitation record to allow the manufacture and installation of an interface component, provided-(1) The applicant owns or has a license to use the design and installation data for the interface component and makes that data available to the FAA upon request;(2) The applicant manufactures the interface component;(3) The applicant's product conforms to its approved type design and the interface component conforms to its approved type design;(4) The assembled product with the installed interface component is in a condition for safe operation; and(5) The applicant complies with any other conditions and limitations the FAA considers necessary.Doc. No. FAA-2013-0933, Amdt. 21-98, 80 FR 59031, Oct. 1, 2015, as amended by Amdt. 21-98A, 80 FR 59031, Dec. 17, 2015