FAA · Supplemental Type Certificate
STC SA1377GL
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)
What is an STC?
A Supplemental Type Certificate authorizes a major modification or alteration to an FAA-certificated aircraft. STCs are how operators legally install new avionics, change fuel systems, add floats, swap engines, etc. — every change beyond a minor modification needs one.
Applicable aircraft (1)
Certification basis — 14 CFR
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗