FAA · Supplemental Type Certificate
STC SA528EA
Installation of KX-160 NAV/COM, 618M-1A VHF COM., T-10-R HF COMM, ARC Type 21A ADF headsets, microphones and speakers.
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 (5)
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗