FAA · Supplemental Type Certificate
STC SA2-422
Modification to provide eligibility for airworthiness certification in the transport category under SR-406C.
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 (12)
- A-786 Curtiss-Wright Corporation · C-46E
- A-772 Flying Tiger Line Inc. · C-46A
- A-772 Flying Tiger Line Inc. · C-46D
- A-772 Flying Tiger Line Inc. · C-46E
- A-772 Flying Tiger Line Inc. · C-46F
- A-789 L. B. Smith Aircraft Corporation · C-46A
- A-789 L. B. Smith Aircraft Corporation · C-46D
- A-789 L. B. Smith Aircraft Corporation · C-46F
- A-808 Skyways International Trading and Transport Co. · C-46F
- 3A2 Airlift International Inc. · C-46A
- 3A2 Airlift International Inc. · C-46D
- 3A2 Airlift International Inc. · C-46F
Certification basis — 14 CFR
Specific sections
- Sec. 111
- Sec. 113
- Sec. 115
- Sec. 117
- Sec. 119
- Sec. 120
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗