# STC SA3-77

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Modern Die & Tool Co, United States
- Description: Vertical fin plates attached to tip ribs of horizontal stabilizer seaplane operation only.
- Status date: January 1, 1960
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 1A6](https://openairdocs.org/tcds/1A6)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EF25D4CE7340DB0A862570CB00586608.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA3-77

## ADs that name it (0)

None.

## Approved models (1)

- The New Piper Aircraft Inc. PA-22 Series ([TCDS 1A6](https://openairdocs.org/tcds/1A6))

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