# STC SA689NW - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Sierra Industries Inc, United States - Description: Installation of transponder identification switch in the left hand control wheel. - Applied: November 13, 1978 - Status date: September 8, 2005 - Product: Aircraft, Small Airplane - Certification basis: Part 21, Part 25 - Data sheets: [TCDS A22CE](https://openairdocs.org/tcds/A22CE) - Certificate PDF: https://openairdocs.org/files/sha256/34/49/3449962b3fe263a24ec3047454d449ed7125cbb48b542cbd31445ad41c8cb1bf - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/819D1B6F2772E758862570A6006DC66B.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA689NW ## ADs that name it (0) None. ## Approved models (1) - Textron Aviation Inc. 500 ([TCDS A22CE](https://openairdocs.org/tcds/A22CE)) ## 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. FAA Form 8110-2 (5/14) Page 1 of 2 Reissued on July 31, 2017 to supersede the original STC, which has been lost or misplaced. Number: SA689NW Part 25 of the Federal Aviation Regulations. Original Product – Type Certificate Number: A22CE Make: Cessna Model: 500 Installation of transponder identification switch in the left hand control wheel in accordance with Advanced Systems Technology, Inc., Drawing No. 10-82009(B) dated November 13, 1978. Data pertaining to this modification are considered inadequate for duplication in other aircraft. This approval is limited to the installation in Cessna 500, S/N 0174 only. A copy of this Certificate and Installation Instructions Drawing 10-82009(B) shall be maintained as part of the permanent records for the modified aircraft. Compatibility of this design change with previously approved modifications must be determined by the installer. 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. Date of Application: November 13, 1978 Date Reissued: 12/10/81; 10/10/86; 9/8/05; 7/31/17 Date of Issuance: November 22, 1978 Date Amended: Signature Title Jim Grigg Manager, Fort Worth A CO Branch, Compliance & Airworthiness Division Sierra Industries, Ltd. 122 Howard Langford Drive Uvalde, TX 78801 FAA Form 8110-2 (5/14) Page 2 of 2 Transfer the ownership of Supplemental Type Certificate Number: SA689NW To (Name and address of transferee) From (Name and address of grantor) United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA18NW FAA Form 8110-2 (5/14) Page 3 of 3 ## Every issue (1) - September 8, 2005: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/34/49/3449962b3fe263a24ec3047454d449ed7125cbb48b542cbd31445ad41c8cb1bf) --- 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.