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Atlas / STC / ST04448CH

FAA · Supplemental Type Certificate

STC ST04448CH

Avionics upgrade installation of a Garmin GTN (TM) 750 Touchscreen Navigator interfaced to existing pilot side instruments and existing Collins AP-105 autopilot and added GWX (TM) 70 Weather Radar. The Garmin GTN (TM) 750 GPS is paired with the added GTX (TM) 345R Transponders for Automatic Broadcast Surveillance (ADS-B) OUT and ADS-B IN capability with wireless download connectivity utilizing Garmin Connext®. Optional second Garmin GTN (TM) 650/750 interfaced to existing copilot side instruments only.

Current Amended Aircraft Rev 09/01/2021 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 ↗