# STC SA3-393

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Rockwell Intl, United States
- Description: Installation of Sperry D-3 engine analyzer.
- Status date: March 25, 1981
- 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/370E930850CB1FE785256CC20008CC59.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3-393

## 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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