# STC SA1739SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Provincetown-Boston Airlines, United States
- Description: Installation of shoulder harness provisions for pilot, co-pilot and observer.
- Applied: November 30, 1984
- Status date: January 23, 1985
- Product: Aircraft, Large Airplane
- Data sheets: [TCDS A-669](https://openairdocs.org/tcds/A-669)
- Certificate PDF: https://openairdocs.org/files/sha256/ed/79/ed791e8ce28aa78d8465e64461a8e87fcd462f6afc4be0065fbb2e3e84b6983e
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID125638051220250509152251.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1739SO

## ADs that name it (0)

None.

## Approved models (5)

- The Boeing Company DC3A-S1C3G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-S1CG ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-S4C4G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-SC3G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-SCG ([TCDS A-669](https://openairdocs.org/tcds/A-669))

## What the certificate says

The certificate is a scan without a text layer; open the PDF to read it.

## Every issue (1)

- January 23, 1985: Issued, Current. [certificate](https://openairdocs.org/files/sha256/ed/79/ed791e8ce28aa78d8465e64461a8e87fcd462f6afc4be0065fbb2e3e84b6983e)

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