FAA · Supplemental Type Certificate
STC SR04502CH
Installation of Heli-Preheat Kit, p/n TA3306-1 for 115 volt application in accordance with Heli-Preheat Kit drawing TA3306-1 Revision C, dated December 11, 2023 or later FAA approved revisions and Installation Instruction document # TNH3306 Revision C, dated September 30, 2021 or later FAA approved revisions
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 (6)
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 ↗