# STC SA2938NM

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Thompson Aero Products, United States
- Description: Fabrication and installation of external hinged-plate spoilers and dive brakes.
- Applied: June 30, 1984
- Status date: May 7, 1986
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A13CE](https://openairdocs.org/tcds/A13CE)
- Certificate PDF: https://openairdocs.org/files/sha256/73/d9/73d9824f86607dcc53e077670e156ea3518393fedfeef77c4af5945191d4e730
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CBD05C25160874C4862579CE006043CD.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA2938NM

## ADs that name it (0)

None.

## Approved models (3)

- Cessna Aircraft Company 177 ([TCDS A13CE](https://openairdocs.org/tcds/A13CE))
- Cessna Aircraft Company 177A ([TCDS A13CE](https://openairdocs.org/tcds/A13CE))
- Cessna Aircraft Company 177B ([TCDS A13CE](https://openairdocs.org/tcds/A13CE))

## 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: SA2938NM This certificate issued to: Thompson Aero Products Part 23 of the Federal Aviation Regulationa Original Product - Type Certificate Number: A13CE Make: Cessna Model: 177, 177A, 1778 Description of Type Design Change:

Fabrication and installation of external hinged-plate spoilers and dive brakes in accordance with FAA sealed Thompson Aero Products Production Drawing List Number DRC-177-P, dated May 24, 1985, or later FAA approved revision.

The approval of this change in type design applies to basic Limitations and Conditions: Cessna Model 177, 177A and 177B airplanes only. This approval should not be extended to other airplanes of these models on which other previously approved modifications are incorporated unless it is determined by the installer that the modifications will introduce no adverse effect on the airworthiness of that aircraft. Airplanes equipped with this modification must be operated in accordance with the FAA approved Supplemental Airplane Flight Manual dated June 3, 1985, or later FAA approved revision, a copy of which must be carried in the moditied airplane at all times.

Date of Application: June 30, 1984 Date Reissued:

Date of Issuance: June 3, 1985 Date Amended: May 1, 1986 FEDERAL AVIATION By Direction of the Administrator William B Ashwartt (Signature ) TOMINISTRAIO manager. Seattle Aircraft Certification Office (Title)

## Every issue (1)

- May 7, 1986: Amended, Current. [certificate](https://openairdocs.org/files/sha256/73/d9/73d9824f86607dcc53e077670e156ea3518393fedfeef77c4af5945191d4e730)

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