# STC SA09409AC-D - Type: Supplemental type certificate - Status: Current, Issued - Holder: S-TEC Corporation, United States - Description: Installation of S-TEC System 20/30 Single and Two Axis Automatic flight Guidance Systems, Model ST-855-20/30. - Applied: May 20, 1999 - Status date: May 24, 1999 - Product: Aircraft, Small Airplane - Certification basis: Part 21 - Data sheets: [TCDS A1CE](https://openairdocs.org/tcds/A1CE) - Certificate PDF: https://openairdocs.org/files/sha256/06/a3/06a30f6e6b992434117d49fe4037e52fe042f1926dff9db394108785879d530e - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/26F618B5B71C622185256CC1007F3AE6.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA09409AC-D ## ADs that name it (0) None. ## Approved models (14) - Beechcraft Corporation 19A ([TCDS A1CE](https://openairdocs.org/tcds/A1CE)) - Beechcraft Corporation 23 ([TCDS A1CE](https://openairdocs.org/tcds/A1CE)) - Beechcraft Corporation A23 ([TCDS A1CE](https://openairdocs.org/tcds/A1CE)) - Beechcraft Corporation A23-19 ([TCDS A1CE](https://openairdocs.org/tcds/A1CE)) - Beechcraft Corporation A23-24 ([TCDS A1CE](https://openairdocs.org/tcds/A1CE)) - Beechcraft Corporation A23A ([TCDS A1CE](https://openairdocs.org/tcds/A1CE)) - Beechcraft Corporation A24 ([TCDS A1CE](https://openairdocs.org/tcds/A1CE)) - Beechcraft Corporation A24R ([TCDS A1CE](https://openairdocs.org/tcds/A1CE)) - Beechcraft Corporation B19 ([TCDS A1CE](https://openairdocs.org/tcds/A1CE)) - Beechcraft Corporation B23 ([TCDS A1CE](https://openairdocs.org/tcds/A1CE)) - Beechcraft Corporation B24R ([TCDS A1CE](https://openairdocs.org/tcds/A1CE)) - Beechcraft Corporation C23 ([TCDS A1CE](https://openairdocs.org/tcds/A1CE)) - Beechcraft Corporation C24R ([TCDS A1CE](https://openairdocs.org/tcds/A1CE)) - Beechcraft Corporation M19A ([TCDS A1CE](https://openairdocs.org/tcds/A1CE)) ## What the certificate says This is OCR from the scanned FAA certificate. OCR can misread letters and numbers. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number 5A09409 AC-D This certificate issued to: S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 Certifies that the change in the type design for the following product with the limitations and conditions therefos as specifed herson meets the airosthiness regurements of Past 3 of the Civil di Regulations. Original Product I ype Certificate A umber: AICE Make: Beech Model: C23, A24R, B24R, C24R, A23-19, 19A, M19A, B19, Description of Type Design Change: 23, A23, A23A, A23-24, B23, and A24 Installation of S-TEC System 20/30 Single and Two Axis Automatic Flight Guidance Systems, Model ST-855-20/30, according to Bulletin No. 955, dated 5-19-99 and Master Drawing List No. 921154, dated 5-19-99 or later FAA Approved revisions of the above data (14 Volt System). (See Continuation Sheet, Page 2, a part of this STC.) 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. saspended, reecked or a termination date is othernse established by the A drinistrator of the. I ederal d viation Administration. Date of Application: 5-20-99 Date Reissued: Date of Issuance: 5-24-99 Date Amended: By Direction of the Administrator FEDERAL AVIATION mill K. (Signature) TOMINSTRATO DAS Staff Coordinator, DAS 5 SW Michael Keirnan (Title) le by a fine of not exceeding $1,000, or impr ment not exce eding 3 years, or both red in accordance with FAR 21.47. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09409 AC-D Limitations and Conditions: (con't.) Eligible only on Beech models A23-19, 19A, M19A, B19, 23, A23, A23A, A23-24, B23, and A24 when modified in accordance with Beech Service News Letter Volume XX, No. 11 and Beech Service Instructions No. 0253-151. 2. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891846, dated 5-24-99 is required for Beech models A24R, B24R, and C24R for S-TEC System 20 or later FAA Approved revisions of the above supplement. FAA/DAS Approved Supplemental Flight Manual, P/N 891847, dated 5-24-99 is required for Beech model C23 and Beech models A23-19, 19A, M19A, B19, 23, A23, A23A, A23-24, B23, and A24 when modified in accordance with Beech Service News Letter Volume XX, No. 11 and Beech Service Instructions No. 0253-151 for S-TEC System 20 or later FAA Approved revisions of the above supplement. 4. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891848, dated 5-24-99 is required for Beech models A24R, B24R, and C24R for S-TEC System 30 or later FAA Approved revisions of the above supplement. 5. FAA/DAS Approved Supplemental Flight Manual, P/N 891849, dated 5-24-99 is required for Beech model C23 and Beech models A23-19, 19A, M19A, B19, 23, A23, A23A, A23-24, B23, and A24 when modified in accordance with Beech Service News Letter Volume XX, No. 11 and Beech Service Instructions No. 0253-151 for S-TEC System 30 or later FAA Approved revisions of the above supplement. 6. Compatibility of this modification with other previously approved modifications must be determined by the installer. FAA Form 8110-2-1(10-69) Page 2 of 2 TRANSFER ENDORSEMENT 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 & street) (City, State, and ZIP code) Extent of Authority (if licensing agreement): Signature of grantor (In ink): ## Every issue (1) - May 24, 1999: Issued, Current. [certificate](https://openairdocs.org/files/sha256/06/a3/06a30f6e6b992434117d49fe4037e52fe042f1926dff9db394108785879d530e) --- 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.