# STC SA4-99

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Johnson R W, United States
- Description: Fiberglass cloth with resin over muslin applied.
- Status date: January 1, 1960
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-761](https://openairdocs.org/tcds/A-761)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3B6B8A75E4B4D16986256CE50075A750.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-99

## ADs that name it (0)

None.

## Approved models (1)

- American Champion Aircraft Corp. 11AC ([TCDS A-761](https://openairdocs.org/tcds/A-761))

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