# STC SA900NW

- 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 in accordance with Avcon Master Drawing List No. 1086 dated November 16, 2010, or later FAA approved revision.  An FAA approved Airplane Flight Manual Supplement is required for each model.
- Applied: July 15, 1979
- 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/sha256/32/61/3261adf38794d07151f176fbaff5fda9972aee9ddb86762ba78619a8ebf4cfb9
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/87D05739E7CF75DE8625783A005637C4.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA900NW

## ADs that name it (0)

None.

## Approved models (6)

- 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))
- Learjet Inc. 25D ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 25F ([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, 25C, 25D, and 25F

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. 1086 dated November 16, 2010, or later FAA approved revision. An 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 a product, the holder must give the other person written evidence of that permission. A copy of this Certificate and Addendum No. SA900NW shall be maintained as part of the permanent records for the modified aircraft.

Date of application: July 15, 1979

Date of issuance: March 03, 1980

Date reissued: 11/06/80; 12/01/99, 09/08/05;

06/03/10; 11/16/10

Date amended: May 14, 2001; June 12, 2001

Original signed by Grant E. Youngdahl

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

(Title)

FAA Form 8110-2-1(10-69) Page 2 of 4

FAA Form 8110-2-1(10-69) Page 3 of 4

Number SA900NW Date of Issuance: March 03, 1980 Date Amended: June 12, 2001 Date Reissued: November 16, 2010

**SUPPLEMENTAL TYPE CERTIFICATE NO. SA900NW**

The limitations noted in Type Certificate Data Sheet No. A10CE are applicable except as follows:

Models 25, 25A, 25B, and 25C

V a (Maneuvering at 15,000 lbs) Sea Level 202 KCAS 45,000 ft 216 KCAS

V fe (Flaps Extended) Landing 150 KCAS Flaps 20° 200 KCAS Flaps 10° 250 KCAS

V mo (Maximum Operating) 25 and 25A with G.L.C. ECR 1513 25B and 25C with G.L.C. ECR 1511

S.L. to 14,000 ft. 300 KCAS 14,000 ft to 23,900 ft 350 KCAS

M mo (Maximum Operating) Above 23,900 ft (AFC/SS’ Operating) 0.81M Above 23,900 ft (AFC/SS Inoperative) 0.77M

Stabilizer Travel Limits Upper Limit -0 0 52’ to –10 8’ Lower Limit -8 0 30’ to –90 00’

FAA Form 8110-2-1(10-69) Page 4 of 4

Number SA900NW Date of Issuance: March 03, 1980 Date Amended: June 12, 2001 Date Reissued: November 16, 2010

Models 25D and 25F

V a (Maneuvering at 15,000 lbs) Sea Level 182 KCAS 45,000 ft 195 KCAS

V mo (Maximum Operating) S.L. to 14,000 ft. 300 KCAS 14,000 ft to 23,900 ft 350 KCAS

M mo (Maximum Operating) Above 23,900 ft AFC/SS Operating 0.81M Above 23,900 ft AFC/SS Inoperative 0.77M

V fe (Flaps Extended) Landing 150 KCAS Flaps 20° 200 KCAS Flaps 10° 250 KCAS

Stabilizer Travel Limits Upper Limit -0 0 52’ to –10 8’ Lower Limit -8 0 30’ to –90 00’

--END--

## Every issue (2)

- November 16, 2010: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/32/61/3261adf38794d07151f176fbaff5fda9972aee9ddb86762ba78619a8ebf4cfb9)
- September 8, 2005: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/63/54/6354b7997bc0a0049686abd52b24bbc9308010879aa95f2696ca06d70ce9449f)

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