# STC SA4-339

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Saunders Walter B, United States
- Description: Curtiss metal propeller 55518 and replacement of .080 windshield with bubble .125 (grade I) plexiglass.
- Status date: January 1, 1960
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 658](https://openairdocs.org/tcds/658)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C2527754B6EBC59186256CE20074C97B.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-339

## ADs that name it (0)

None.

## Approved models (1)

- Ryan Aeronautical Company SCW-145 ([TCDS 658](https://openairdocs.org/tcds/658))

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