# STC SA4934NM - Type: Supplemental type certificate - Status: Current, Amended - Holder: Micro AeroDynamics Inc, United States - Description: Installation of vortex generators on the wing and vertical stabilizer, and 5% take off gross weight increase. - Applied: January 22, 1990 - Status date: September 25, 2019 - Product: Aircraft, Small Airplane - Certification basis: Part 3, Part 21 - Data sheets: [TCDS 3A25](https://openairdocs.org/tcds/3A25) - Certificate PDF: https://openairdocs.org/files/sha256/05/b4/05b424b7e5c8cb84bb0852a770acadfafff0ecb5c56b804a9e0eb09456b45d8a - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0EAA3F53F8578D22862585DE0046A702.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA4934NM ## ADs that name it (0) None. ## Approved models (3) - Textron Aviation Inc. 335 ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) - Textron Aviation Inc. 340 ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) - Textron Aviation Inc. 340A ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) ## 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. Number SA4934NM This certificate, issued to Micro AeroDynamics, Inc. 4000 Airport Road, Suite D Anacortes, WA 98221 Part 3 of the Civil Air Regulations. Original ProductType Certificate Number: 3A25 Make: Textron Aviation Inc. (formerly Cessna) Model: 335, 340, 340A Description of the Type Design Change: Installation of vortex generators on the wings and vertical stabilizer and nacelle strakes in accordance with Drawing List DL-340, Revision C, dated May 7, 1991, and Installation Manual part number C-340, Revision A, dated May 7, 1991, or Installation Manual Document MA2102, Revision E, dated August 13, 2019, or later Federal Aviation Administration (FAA) approved revisions. Maintained in accordance with Installation Manual Document MA2102, Revision E, dated August 13, 2019, or later Federal Aviation Administration (FAA) approved revision. Limitations and Conditions: Approval of this change in type design applies to the above model aircraft only. This approval should not be extended to other aircraft of this model series unless the installer determines that the relationship between this change and any other previously incorporated app roved modifications will introduce no adverse effect upon the airworthiness of that aircraft. Date of application: January 22, 1990 Date reissued: Date of issuance: May 18, 1990 Date amended: August 10, 1990; May 31, 1991; July 26, 1991; September 28, 2004; September 25, 2019 FAA FORM 8110-2 (5/14) PAGE 1 OF 3 PAGES By direction of the Administrator (Signature) Acting Manager, Seattle ACO Branch (Title) Transfer the ownership of Supplemental Type Certificate Number to (Name of Transferee) (Address of Transferee) (Number and Street) (City, State, and ZIP Code) from (Name of Grantor) (Print or Type) (Address of Grantor) (Number and Street) (City, State, and ZIP Code) Signature of Grantor (In Ink): U.S. GPO: 1987-763-289 United States of America Department of Transportation - Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number SA4934NM Micro AeroDynamics, Inc. Issued: May 18, 1990 Reissued: Amended: August 10, 1990; May 31, 1991; July 26, 1991; September 28, 2004; September 25, 2019 Description of the Type Design Change continued: The installer has two options when installing this type design change, as described in Installation Manual Document MA2102: OPTION 1: NO CHANGE IN PERFORMANCE: The vortex generators and nacelle strakes are installed on the aircraft, but the airspeed indicator is not changed and the Pilot’s Operating Handbook is not changed to reflect any improvement in performance. The aircraft continues to be operated in accordance with the existing Pilot’s Operating Handbook. OPTION 2: CHANGE IN PERFORMANCE: The vortex generators and nacelle strakes are installed on the aircraft, the airspeed indicator is changed, and an Aircraft Flight Manual Supplement is added to the Pilot’s Operating Handbook to reflect a 5% Take Off Gross Weight increase and reduced Vs, Vso, and Vmca. When OPTION 2 is chosen by the installer, the aircraft shall be operated in accordance with the applicable Aircraft Flight Manual Supplement (AFMS) shown below, or later FAA-approved revision: Document No. Revision Dated C335 AFMS-1 IR July 24, 1991 C340-AFMS-M A May 29, 1991 C340-AFMS-K IR May 29, 1991 C340A-AFMS A August 4, 1992 R340-Supp-1 IR February 1, 1991 R340-Supp-2 IR February 1, 1991 R340-Supp-3 IR February 1, 1991 NOTE: This STC is compatible with STC SA474NW. Maximum landing weights are not affected by this type design change. A copy of this certificate must be maintained as part of the permanent records of the modified aircraft. When OPTION 2 is chosen by the installer, the applicable AFMS must be maintained as part of the permanent records of the modified aircraft. 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. - END - **FAA FORM 8110-2 (5/14) PAGE 3 OF 3 PAGES** ## Every issue (2) - September 25, 2019: Amended, Current. [certificate](https://openairdocs.org/files/sha256/05/b4/05b424b7e5c8cb84bb0852a770acadfafff0ecb5c56b804a9e0eb09456b45d8a) - September 28, 2004: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/c1/f1/c1f182cb6f6f0174e55bc3c1307c7a087ca8270950541d05cf5152773a1c63fa) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.