FAA · Supplemental Type Certificate
STC ST04430AT
Installation of Cobham Aviator 300D Inmarsat Satellite Communication System to provide means for voice communication using the Plain Old Telephone Service (POTS), and provides backup for the VHF-3 radio as the secondary media for ACARS.
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 (4)
Specific sections
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗