# STC SA2921WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Helicorp Inc., United States
- Description: Reduce size of cockpit openings, install rounded windshields, flush rivet and increase fuselage skin gages, install internal top longerons, remove external top longerons and install internal aileron balance weight.
- Applied: April 9, 1974
- Status date: April 30, 2008
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-749](https://openairdocs.org/tcds/A-749)
- Certificate PDF: https://openairdocs.org/files/sha256/d8/c2/d8c21c0f2aedd5386af822a2b5bb16df0d1fffd468e5b9e9a4309692b3ffedbe
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/762D873C3CA9374A86257C7E006E110D.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2921WE

## ADs that name it (0)

None.

## Approved models (1)

- Ryan Aeronautical Company ST-3KR ([TCDS A-749](https://openairdocs.org/tcds/A-749))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

Part 04 of the Civil Air R egulations .

effective April 1, 1941.

Original Product --Type Certificate N umber :

Description of Type Design Change: Reduce size of cockpit openings, install rounded windshields, flush rivet and increase fuselage skin gages, install internal top longerons, remove external top longerons and install internal aileron balance weight in accordance with Component Air Inc. Drawings CAI-ST5-1000 dated 7-1-74, CAI-A22-F22-1032 dated 7-2-74 and CAI-A22-1100 dated 7-5-74.

Removal of the overturn structure is not approved.

1) Compatibility of this design change with previously approved modifications must be determined by the installer.

2) If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission.

This certificate and the supporting data, which is the basis for approval, shall remain in effect until surrendered, suspended, revoked or a termination date is otherwise established by the A dministrator of the F ederal A viation A dministration.

Helicorp Inc.

295 Canvasback Trail Locust Grove, GA 30248

A-749 M ake : Ryan M odel : ST-3KR Date of application : April 9, 1974

Date of issuance : August 14, 1974 Date reissued : August 7, 1990, April 30, 2008

B y direction of the A dministrator

Original Signed By:

Karol Mordasiewicz (Signature) Karol Mordasiewicz Manager, Airframe and Administrative Branch Chicago Aircraft Certification Office

(Title)

FAA FORM 8110-2-1(10-69) PAGE 2 of 2 PAGES

SA2921WE

## Every issue (1)

- April 30, 2008: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/d8/c2/d8c21c0f2aedd5386af822a2b5bb16df0d1fffd468e5b9e9a4309692b3ffedbe)

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