FAA · Supplemental Type Certificate
STC SA12225AC
This STC will incorporate P&W 1700 rpm propeller reduction gearbox on P&WC engines to allow Hartzell HC-B5MP-3( ), propeller installation
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 (3)
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗