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Atlas / STC / SA01218AT

FAA · Supplemental Type Certificate

STC SA01218AT

Installation of a Teledyne Continental Motors Model IO-550-D engine and either a Hartzell Model PHC-C3YF-1RF/F8468A( )-6R or PHC-C3YF-1RF/F7691( ) or PHC-G3YF-1RF/F8468A( )-6R or PHC-G3YF-1RF/F7691( )or McCauley Mod D3A34C401/90DFA-10 3-blade propeller.

Current Amended Aircraft Small Airplane Rev 03/17/2026 View PDF on drs.faa.gov ↗

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.

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 ↗