# STC SA4-780

- Type: Supplemental type certificate
- Status: Historical, Reissued
- Holder: Jay- Dee Aircraft Supply Co, United States
- Description: Engine baffles on aircraft with Pratt & Whitney R-1830-92 engines.
- Status date: September 27, 1974
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-669](https://openairdocs.org/tcds/A-669)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DDE2D23CB3EE526585256CC2000C5F7F.0001
- Page: https://openairdocs.org/stc/SA4-780

## ADs that name it (0)

None.

## Approved models (3)

- 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))

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.