FAA · Supplemental Type Certificate
STC ST11289DS
An update to the Communication Management Unit (CMU) to add or update the 3rd VHF Datalink to support Controller Pilot Data Link Communication (CPDLC)
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 (1)
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 ↗