FAA · Supplemental Type Certificate
STC SA377NW
Installation of Hartzell HC-B3W30-2E/W10160R-6 and/or W10160-6 propellers, governors, and spinners on Pratt and Whitney R-985 series engines
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 (5)
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗