# STC SA946NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Davison's Air Service Inc, United States
- Description: Installation of squared-off wing tips
- Applied: January 31, 1979
- Status date: June 11, 1980
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A4SW](https://openairdocs.org/tcds/A4SW)
- Certificate PDF: https://openairdocs.org/files/sha256/5b/ab/5bab3c199a1ad16db12c67ac92c7ae4d2c5ec06c5a62719b51b3851489bf9dc8
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7E5BDD600700FBD286257A3F0057BA4B.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA946NW

## ADs that name it (0)

None.

## Approved models (1)

- Thrush Aircraft Inc. S-2R ([TCDS A4SW](https://openairdocs.org/tcds/A4SW))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA916NW This certificate issued to: Davison's Air Service, Inc.

Purt 8 of the CiViI Air Regulations, effective October 11, 1950.

Original Product - Type Certificute Number: AASW Make: Ayres Corporation Mull: S-2R (Restricted) with Machen, Inc. letter report (Sheet B), dated May 23, 1980. Descriplin flypeS esiyn bhange: Installation of squared-off wing tips in accordance NOTE: The squared-off tips result in the same span (44' 5") but an increase in wing area of 6.84 square feet.

Similalions and bendilins: Data pertaining to this modification are considered inadequate for duplication in other aircraft. This approval is limited to the installation in Ayres Corporation S-2R, Serial Number 1643R only. A copy of this Certificate shall be maintained as part of the permanent records for the modified aircraft.

Date of Application: January 31, 1979 Date Reissued:

Date of Issuance: . June 11, 1980 Date Amended:

FEDERAL AVIATION By Direction of the Administrator . D.P. Reggin TOMINISTRATO Chief, Engineering and Manufacturing Branch (Title)

47.

## Every issue (1)

- June 11, 1980: Issued, Current. [certificate](https://openairdocs.org/files/sha256/5b/ab/5bab3c199a1ad16db12c67ac92c7ae4d2c5ec06c5a62719b51b3851489bf9dc8)

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