# STC SA3-394

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Purdue Aeronautics Corp, United States
- Description: 24-volt electrical system.
- Status date: January 1, 1960
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-618](https://openairdocs.org/tcds/A-618)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3715505E1D1F19AF862570CB0055375D.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3-394

## ADs that name it (0)

None.

## Approved models (1)

- McDonnell Douglas Corporation DC-3 Series ([TCDS A-618](https://openairdocs.org/tcds/A-618))

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