# STC SA09354AC-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-812-20/30 - Applied: April 10, 1998 - Status date: April 14, 1998 - Product: Aircraft, Small Multi-Engine - Certification basis: Part 21 - Data sheets: [TCDS 3A10](https://openairdocs.org/tcds/3A10) - Certificate PDF: https://openairdocs.org/files/sha256/12/e9/12e92229b4ae11bf15be91d16071ca2d82e1e6ec228dab107b6fb8c4313677a4 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/69BC6C8B879A70B785256CC1007F3AAC.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA09354AC-D ## ADs that name it (0) None. ## Approved models (12) - Cessna Aircraft Company 310I ([TCDS 3A10](https://openairdocs.org/tcds/3A10)) - Cessna Aircraft Company 310J ([TCDS 3A10](https://openairdocs.org/tcds/3A10)) - Cessna Aircraft Company 310K ([TCDS 3A10](https://openairdocs.org/tcds/3A10)) - Cessna Aircraft Company 310L ([TCDS 3A10](https://openairdocs.org/tcds/3A10)) - Cessna Aircraft Company 310N ([TCDS 3A10](https://openairdocs.org/tcds/3A10)) - Cessna Aircraft Company 310P ([TCDS 3A10](https://openairdocs.org/tcds/3A10)) - Cessna Aircraft Company 310Q ([TCDS 3A10](https://openairdocs.org/tcds/3A10)) - Cessna Aircraft Company 310R ([TCDS 3A10](https://openairdocs.org/tcds/3A10)) - Cessna Aircraft Company E310J ([TCDS 3A10](https://openairdocs.org/tcds/3A10)) - Cessna Aircraft Company T310P ([TCDS 3A10](https://openairdocs.org/tcds/3A10)) - Cessna Aircraft Company T310Q ([TCDS 3A10](https://openairdocs.org/tcds/3A10)) - Cessna Aircraft Company T310R ([TCDS 3A10](https://openairdocs.org/tcds/3A10)) ## 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: SA09354AC-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 froduct with the timitations and conditions therefor as specifed hereon meets the aimorthiness requiements of F at 3 of the Eird As Regulations. Original Product Type Certificate A umber: 3A10 Al ate : Cessna Al cdel: 3101, 310J, E310J, 310K, 310L, 310N, 310P. T310P, 310Q, T310Q, 310R, and T310R Description of 9 ype Design Change; Installation of S-TEC System 20/30 Single and Two Axis Automatic Flight Guidance Systems, Model ST-812-20/30, according to Bulletin No. 912, dated 4-08-98 and Master Drawing List No. 921087. dated 4-08-98 or later FAA Approved revisions of the above data (28 Volt System). Also eligible on Models 3101, 310J, E310J, 310K, 310L and 310N When Modified Per STC SA412SO (300 H.P. Colemill Conversion). Also eligible on Models T310P and T310Q When Modified Per STC SA2750SW (RAM Modification). (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. suspended, revched or a termination date is othernise established by the Administrator of the Federat / viation Administration. Date of Application: 4-10-98 Date Reissued: Date of Issuance: 4-14-98 Date Amended: By Direction of the Administrator FEDERAL AVIATION Wusin Smus TOMINSTRATO William J. Thomas DAS Staff Coordinator, DAS 5 SW (Title) TOO OL MU dance wIth FAR 21.47. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09354AC-D Limitations and Conditions: (con t.) 3. FAA/DAS Approved Supplemental Flight Manual, P/N 891703, dated 4-14-98 is required for Cessna Models 3101, 310J, E310J, 310K, 310L, and 310N And The Above Models When Modified in accordance with STC SA412SO (300 H.P. Colemill Conversion) for S-TEC System 20 or later FAA Approved revisions of the above supplement. 4 FAA/DAS Approved Supplemental Flight Manual, P/N 891704, dated 4-14-98 is required for Cessna Models 310P, T310P, 310Q, and T310Q: and T310P and T310Q When Modified Per STC SA2750SW (RAM Modification) for S-TEC System 20 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 891705, dated 4-14-98 is required for Cessna Models 310R and T310R for S-TEC System 20 or later FAA Approved revisions of the above supplement. 6. FAA/DAS Approved Supplemental Flight Manual, P/N 891707, dated 4-14-98 is required for Cessna Models 3101, 310J, E310J, 310K, 310L, and 310N And The Above Models When Modified in accordance with STC SA412SO (300 H.P. Colemill Conversion) for S-TEC System 30 or later FAA Approved revisions of the above supplement. 7. FAA/DAS Approved Supplemental Flight Manual, P/N 891708, dated 4-14-98 is required for Cessna Models 310P, T310P, 310Q, and T310Q; and T310P and T310Q When Modified Per STC SA2750SW (RAM Modification) for S-TEC System 30 or later FAA Approved revisions of the above supplement. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement. P/N 891709, dated 4-14-98 is required for Cessna Models 310R and T310R for S-TEC System 30 or later FAA Approved revisions of the above supplement. Compatibility of this modification with other previously approved modifications must be determined by the installer. FAA Form 8110-2-1 (10-691 Page 2 of 2 INSTRUCTIONS: The tranafer endorsement below may be used to notify the appropriate FAA Regional Office of the transfer of the Supplemental Type Certificate. The FAA will reissue the certificate in the name of the transferee and forward it to him. 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) - April 14, 1998: Issued, Current. [certificate](https://openairdocs.org/files/sha256/12/e9/12e92229b4ae11bf15be91d16071ca2d82e1e6ec228dab107b6fb8c4313677a4) --- 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.