# STC SA4-404

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Glasco-Air Products, United States
- Description: Glass cloth application on control surfaces.
- Status date: January 1, 1960
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-2-571](https://openairdocs.org/tcds/A-2-571)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3F5F097BB378F69A862570D00052A41F.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-404

## ADs that name it (0)

None.

## Approved models (1)

- General Dynamics Corporation BT-13 ([TCDS A-2-571](https://openairdocs.org/tcds/A-2-571))

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