# STC SA1744WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Nelson Filter, United States
- Description: Installation of oil filter assemblies.
- Status date: August 29, 1974
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-772](https://openairdocs.org/tcds/A-772), TCDS 2-576, TCDS L-3-4, [TCDS A-723](https://openairdocs.org/tcds/A-723), TCDS LTC-13, [TCDS 1A7](https://openairdocs.org/tcds/1A7), [TCDS A-795](https://openairdocs.org/tcds/A-795), [TCDS 6A3](https://openairdocs.org/tcds/6A3), [TCDS A-669](https://openairdocs.org/tcds/A-669), [TCDS A-762](https://openairdocs.org/tcds/A-762), [TCDS AL-2](https://openairdocs.org/tcds/AL-2)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/70543337799842B485256CC10083CFC5.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1744WE

## ADs that name it (0)

None.

## Approved models (21)

- Curtiss-Wright Corporation C-46 Series ([TCDS A-772](https://openairdocs.org/tcds/A-772))
- Douglas Aircraft Co. Inc. Army A-26B (TCDS L-3-4)
- Douglas Aircraft Co. Inc. Army A-26C (TCDS L-3-4)
- Douglas Aircraft Co. Inc. Army B-23 (TCDS 2-576)
- Lockheed Aircraft Corporation Army B-34 (TCDS LTC-13)
- Lockheed Aircraft Corporation Lockheed 18 ([TCDS A-723](https://openairdocs.org/tcds/A-723))
- Lockheed Aircraft Corporation Navy PV-1 (TCDS LTC-13)
- Martin-Marietta Corporation 202 ([TCDS A-795](https://openairdocs.org/tcds/A-795))
- Martin-Marietta Corporation 202A ([TCDS A-795](https://openairdocs.org/tcds/A-795))
- Martin-Marietta Corporation 404 ([TCDS 1A7](https://openairdocs.org/tcds/1A7))
- McDonnell Douglas Corporation DC-3A Series ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- McDonnell Douglas Corporation DC-3C Series ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- McDonnell Douglas Corporation DC-3D Series ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- McDonnell Douglas Corporation DC-4 ([TCDS A-762](https://openairdocs.org/tcds/A-762))
- McDonnell Douglas Corporation DC-6A (Navy R6D-1) ([TCDS 6A3](https://openairdocs.org/tcds/6A3))
- McDonnell Douglas Corporation DC-6A (USAF C-118A) ([TCDS 6A3](https://openairdocs.org/tcds/6A3))
- S and R Aviation Services Inc Army B-25C ([TCDS AL-2](https://openairdocs.org/tcds/AL-2))
- S and R Aviation Services Inc Army B-25G ([TCDS AL-2](https://openairdocs.org/tcds/AL-2))
- S and R Aviation Services Inc Army B-25H ([TCDS AL-2](https://openairdocs.org/tcds/AL-2))
- S and R Aviation Services Inc Army B-25J ([TCDS AL-2](https://openairdocs.org/tcds/AL-2))
- S and R Aviation Services Inc Army RB-25 ([TCDS AL-2](https://openairdocs.org/tcds/AL-2))

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