# STC SA317SW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Magnetic Seal Corporation, United States
- Description: Magnetic shaft seal on input and output shafts of Sundstrand constant-speed-drives 40-AD-14, 40-AD-04, 40-AD-12 and 49-AD-06.
- Status date: January 1, 1960
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A21](https://openairdocs.org/tcds/4A21), [TCDS 4A26](https://openairdocs.org/tcds/4A26)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/25AD292D0B8FBBA3862570CB0059FA88.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA317SW

## ADs that name it (0)

None.

## Approved models (2)

- The Boeing Company 707 Series ([TCDS 4A21](https://openairdocs.org/tcds/4A21))
- The Boeing Company 707 Series ([TCDS 4A26](https://openairdocs.org/tcds/4A26))

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