# STC SE508AL

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Univair Aircraft Corp, United States
- Description: Addition of crankcase relief valve.
- Applied: October 24, 1973
- Status date: July 9, 1981
- Product: Engine
- Certification basis: Part 21
- Data sheets: [TCDS E-274](https://openairdocs.org/tcds/E-274)
- Certificate PDF: https://openairdocs.org/files/sha256/19/6d/196df6f01ed8d207af417dad9a6b65aca7ef8ccf4c27ece19c071869b247687d
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4A69FEBABD997D4985256CC2005A759F.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SE508AL

## ADs that name it (0)

None.

## Approved models (58, first 50)

- Lycoming Engines O-320-A1A ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-A1B ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-A2A ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-A2B ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-A2C ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-A2D ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-A3A ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-A3B ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-A3C ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-B1A ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-B1B ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-B2A ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-B2B ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-B2C ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-B3A ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-B3B ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-B3C ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-C1A ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-C1B ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-C2A ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-C2B ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-C2C ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-C3A ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-C3B ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-C3C ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-D1A ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-D1B ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-D1C ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-D1D ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-D1F ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-D2A ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-D2B ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-D2C ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-D2F ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-D2G ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-D2H ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-D2J ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-D3G ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-E1A ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-E1B ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-E1C ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-E1F ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-E1J ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-E2A ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-E2B ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-E2C ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-E2D ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-E2F ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-E2G ([TCDS E-274](https://openairdocs.org/tcds/E-274))
- Lycoming Engines O-320-E2H ([TCDS E-274](https://openairdocs.org/tcds/E-274))

All 58: https://openairdocs.org/stc/SE508AL/models.md

## What the certificate says

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

## Every issue (1)

- July 9, 1981: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/19/6d/196df6f01ed8d207af417dad9a6b65aca7ef8ccf4c27ece19c071869b247687d)

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