Replace existing P&W Model R-985 or R-1340 reciprocating engine installation with P&W turbopropeller engine (PT6A, 6B, -11, -11AG, -15AG, -20, -20A, -20B, -6/C20, -21, -27, -28, -34, -34AG, or -135) and Hartzell propeller (HC-B3TN-3 hub and T10282(+4) or T10282(N) (+4) blades). (G-164A S/N 526 AND ABOVE) View PDF on drs.faa.gov ↗

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