FAA · Supplemental Type Certificate
STC SA1253GL
Install auxiliary cargo door.
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)
- A-669 McDonnell Douglas Corporation · DC3D-R-1830-90C (Army C-117A)
- A-669 McDonnell Douglas Corporation · DC3C-R-1830-90C (Navy R4D-6)
- A-669 McDonnell Douglas Corporation · DC3C-R-1830-90C (Army C-47B)
- A-669 McDonnell Douglas Corporation · DC3C-S1C3G
- A-669 McDonnell Douglas Corporation · DC3C-SC3G
- A-669 McDonnell Douglas Corporation · DC3A-S4C4G
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗