# STC SA4-412

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Bates Aviation Inc, United States
- Description: Large PA-18 tail surfaces.
- Status date: January 1, 1960
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-797](https://openairdocs.org/tcds/A-797)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B7335AFDDEFD6FC8862570D00052A08E.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-412

## ADs that name it (0)

None.

## Approved models (1)

- The New Piper Aircraft Inc. PA-14 ([TCDS A-797](https://openairdocs.org/tcds/A-797))

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