# STC SA3961WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Thrush Aircraft Inc., United States
- Description: Installation of extended engine mount, revised cowling and induction system, Hamilton Standard 22D40 or 12D40 constant speed propeller, and modified elevator trim tab system in accordance with Serv-Aero Engineering, Inc. FAA sealed Master Drawing List MDL5379, dated May 3, 1979, or later FAA approved revision.  Pratt and Whitney R1340-AN-1 engine previously installed per Type Certificate A4SW is required with this installation.  (Restricted Category)
- Applied: November 9, 1978
- Status date: July 30, 2003
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A4SW](https://openairdocs.org/tcds/A4SW)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EF4758064AB50C7586256DAA00665969.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA3961WE

## ADs that name it (0)

None.

## Approved models (1)

- Ayres Corporation S-2R ([TCDS A4SW](https://openairdocs.org/tcds/A4SW))

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