FAA · Supplemental Type Certificate
STC SA1257CE
Installation of King KFC 200, 2 axis, flight control system with a KI 255 (or -256) flight command indicator or a KG 258 attitude horizon gyro with a KC 292 mode controller or stand alone electric trim.
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 ↗