# STC SA290GL

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Parker Hannifin Corp, United States
- Description: Install Cleveland conversion kit No. 199-74 on listed models which use MIL-H-5606 brake fluid (red oil) or kit No. 199-74A on listed models which use Skydrol brake fluid (nonpetroleum base).
- Status date: October 28, 1980
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 2A4](https://openairdocs.org/tcds/2A4)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1EA279AC9A77349485256CC20008CA9B.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA290GL

## ADs that name it (0)

None.

## Approved models (5)

- Twin Commander Aircraft Corporation 560F ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 680 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 680-E ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 680-F ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 720 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))

---
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.