FAA · Supplemental Type Certificate
STC SA03335CH
Removal of propeller unfeathering valve, installation of enlarged rudder trim tab, installation of electric hydraulic pump, installation of volt/amp meter, installation of aux wing float fuel system, installation of sun visors, installation of solid rubber tail wheel/tire assembly, installation of a defroster blower and installation of Weldon fuel boost pumps
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
Specific sections
- Sec. 111
- Sec. 113
- Sec. 115
- Sec. 117
- Sec. 119
- Sec. 120
- § 21.47
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗