Fabrication and installation of the Airframes, Inc., 4-inch wider frame assembly/fuselage, P/N AF18-4, in accordance with Airframes, Inc., Master Data List AF18-4, Revision A, dated April 8, 2003, or later FAA approved revisions. View PDF on drs.faa.gov ↗

The STC PDF is authoritative: installation instructions, ICA requirements and limitations.