# STC SA09235AC-D - Type: Supplemental type certificate - Status: Current, Amended - Holder: S-TEC Corporation, United States - Description: Installation of S-TEC System 55/55X Two Axis Automatic Flight Guidance system, Model ST-667 - Applied: June 6, 1997 - Status date: October 25, 2001 - Product: Aircraft, Single-Engine - Certification basis: Part 21 - Data sheets: [TCDS A1CE](https://openairdocs.org/tcds/A1CE) - Certificate PDF: https://openairdocs.org/files/sha256/bf/76/bf761e43f8c97d9c6e3a1342e45b6abde838180a675a530123d4ddb4669aa452 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C7504E11D6E1C4F885256CC1007F3A33.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA09235AC-D ## ADs that name it (0) None. ## Approved models (10) - Beechcraft Corporation 23 ([TCDS A1CE](https://openairdocs.org/tcds/A1CE)) - Beechcraft Corporation A23 ([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 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)) ## 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: SA09235 AC-D This certificate issued to: S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 Part 3 of the Cirit sin Kegulations. Original Product I ype Certificate A unter: AICE Make: Beech Model: C23, A24R, B24R, C24R, 23, A23, A23A, A23-24, B23, AND A24 Description of Type Design Change: Installation of S-TEC System 55/55X Two Axis Automatic Flight Guidance System, Model ST-667, according to Bulletin No. 767, Revision 2, dated 10-25-01 and Master Drawing List No. 921004, Revision B, dated 10-25-01 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. Date of Application: 6-06-97 Tate wissued: Late of isnance: 6-10-97 Date Amended: 1-15-98, 10-25-01 By Direction of the Administrator FEDERAL AVIATION (Signature) TOMINISTRATO Michael Keirnan DAS Staff Coordinator, DAS 5 SW (Title) United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09235 AC-D Limitations and Conditions: (con't.) Models 23, A23, A23A, A23-24, B23, and A24 eligibility limited to airplanes when modified in accordance with Beech Service Newsletter Volume XX, No. 11 and Beech Service Instructions No. 0253-151. Optional Autotrim System is not approved for Beech Model A24R. FAA/DAS Approved Supplemental Flight Manual, P/N 891417, dated 6-10-97 is required for Beech Model C23 and Beech Models 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 55 or later FAA Approved revisions of the above supplement. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891418, dated 6-10-97 is required for Beech Model A24R for S-TEC System 55 or later FAA Approved revisions of the above supplement. 5. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891419, dated 6-10-97 is required for Beech Models B24R and C24R for S-TEC System 55 or later FAA Approved revisions of the above supplement. 6. FAA/DAS Approved Supplemental Flight Manual, P/N 891417, Revision 1, dated 10-25-01 is required for Beech model C23 and Beech models 23, A23, A23A, A23-24, B23, and A24 when modified in accordance with Beech Service Newsletter Volume XX, No. 11 and Beech Service Instructions No. 0253-151 for S-TEC System 55/55X or later FAA Approved revisions of the above supplement. 7. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891418, Revision 1, dated 10-25-01 is required for Beech model A24R for S-TEC System 55/55X or later FAA Approved revisions of the above supplement. 8. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891419, Revision 1, dated 10-25-01 is required for Beech models B24R and C24R for S-TEC System 55/55X or later FAA Approved revisions of the above supplement. 9. 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 The FAA will zeissue the certificate in the name of the transferee and forward It to him- TRANSFER ENDORSEMENT Transfer the ownership cf Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and 2TP code) from (Name of grantor) (Print or type) (Address of grantor) (Number & street) (City, State, and ZIP codel Extent of Authority (if licensing agreement): Signature of grantor (In ink): ## Every issue (1) - October 25, 2001: Amended, Current. [certificate](https://openairdocs.org/files/sha256/bf/76/bf761e43f8c97d9c6e3a1342e45b6abde838180a675a530123d4ddb4669aa452) --- 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.