Descriptive data pertaining to this modification is considered inadequate for duplication in other aircraft. This approval is limited to the installation made in Piper Model J-3, Serial Number 2057. Installation of a Continental A-75-8 engine and Sensenich Model W70DK-40 wood propeller, and components for a 1200 lb. maximum weight. View PDF on drs.faa.gov ↗

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