# STC SA225NW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Avcon Industries Inc, United States
- Description: Installation of the Mark II performance system, including recontoured wing leading edge, recontoured flap leading edge, wing vortex generator removal, installation of wing stall strips and other minor refinements.
- Applied: March 10, 1975
- Status date: November 16, 2010
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21, Part 25
- Data sheets: [TCDS A10CE](https://openairdocs.org/tcds/A10CE)
- Certificate PDF: https://openairdocs.org/files/sha256/e7/8f/e78ff7e2efd8cf5d189339a8e81547635e542c63002d31e2f3aacd140f9ef5a1
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5CE1D766469CDEA58625783A0050E45B.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA225NW

## ADs that name it (0)

None.

## Approved models (4)

- Learjet Inc. 25 ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 25A ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 25B ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 25C ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))

## 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.

This certificate issued to: AVCON Industries, Inc 714 N. Oliver Road Newton, KS 67114-9444

Part 25 of the Federal Aviation Regulations.

Original Product - Type Certificate Number: A10CE Make: Learjet, Inc Model: 25, 25A, 25B, and 25C

Description of Type Design Change: Installation of the Mark II performance system, including recontoured wing leading edge, recontoured flap leading edge, wing vortex generator removal, installation of wing stall strips and other minor refinements in accordance with Avcon Master Drawing List No. 1081 dated November 16, 2010, or later FAA approved revision. 350 Knowt Vmo authorized if equipped in Avcon Master Drawing List No. 1081 dated November 16, 2010, or later FAA approved revision. A FAA approved airplane flight manual supplement is required for each model.

Limitations and Conditions: The installer must determine whether this design change is compatible with previously approved modifications. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission. A copy of this Certificate and Addendum No. SA225NW shall be maintained as part of the permanent records for the modified aircraft.

Date of application: March 10, 1975

Date of issuance: October 16, 1975

Date reissued: September 08, 2005; June 03, 2010;

November 16, 2010

Date amended: May 07, 2001; May 07, 2001

Original signed by Grant E. Youngdahl

( Signature) Grant E. Youngdahl Program Manager Wichita Airplane Certification Office

(Title)

## Every issue (2)

- November 16, 2010: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/e7/8f/e78ff7e2efd8cf5d189339a8e81547635e542c63002d31e2f3aacd140f9ef5a1)
- September 8, 2005: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/35/04/3504cd3763c7e4095dbbedc25ec5e05ea4b66d7250ba992e89529a3652b9192f)

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