FAA · Supplemental Type Certificate
STC SA398NW
Installation of Hartzell HC-B3R30-4/ R10152-5 1/2 propeller, governor, and spinner (optional) on Pratt & 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 (1)
Certification basis — 14 CFR
Specific sections
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗