Installation of second pilot s seat and dual controls or passenger/cargo compartment in accordance with Serv-Aero Engineering, Inc. FAA sealed Master Drawing List MDL 020180, dated February 1, 1980, or later FAA approved revision. UACL PT6A-34A engine is required with this installation. FAA Approved Serv-Aero Airplane Flight Manual No. 022280 dated March 17, 1980 is required with this installation. (S2R S/N 2526R AND UP MODIFIED BY STC SA3238WE) (S2R-T34 S/N 6009-6049, S/N T34-001 AND UP) View PDF on drs.faa.gov ↗

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