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Atlas / STC / ST01685AT

FAA · Supplemental Type Certificate

STC ST01685AT

Installation of the RTA-44D VHG Data Radio System and/or the RTA-83B VHF Communications System.

Historical Amended Aircraft Large Multi-Engine Rev 09/25/2019 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 ↗