FAA · Supplemental Type Certificate
STC SA1744WE
Installation of oil filter assemblies.
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 (21)
- A-772 Curtiss-Wright Corporation · C-46 Series
- 2-576 Douglas Aircraft Co. Inc. · Army B-23
- L-3-4 Douglas Aircraft Co. Inc. · Army A-26B
- L-3-4 Douglas Aircraft Co. Inc. · Army A-26C
- A-723 Lockheed Aircraft Corporation · Lockheed 18
- LTC-13 Lockheed Aircraft Corporation · Navy PV-1
- LTC-13 Lockheed Aircraft Corporation · Army B-34
- 1A7 Martin-Marietta Corporation · 404
- A-795 Martin-Marietta Corporation · 202A
- A-795 Martin-Marietta Corporation · 202
- 6A3 McDonnell Douglas Corporation · DC-6A (USAF C-118A)
- 6A3 McDonnell Douglas Corporation · DC-6A (Navy R6D-1)
- A-669 McDonnell Douglas Corporation · DC-3D Series
- A-669 McDonnell Douglas Corporation · DC-3A Series
- A-669 McDonnell Douglas Corporation · DC-3C Series
- A-762 McDonnell Douglas Corporation · DC-4
- AL-2 S and R Aviation Services Inc · Army B-25C
- AL-2 S and R Aviation Services Inc · Army B-25G
- AL-2 S and R Aviation Services Inc · Army B-25H
- AL-2 S and R Aviation Services Inc · Army B-25J
- AL-2 S and R Aviation Services Inc · Army RB-25
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 ↗