# STC SA5362SW-D - Type: Supplemental type certificate - Status: Current, Amended - Holder: S-TEC Corporation, United States - Description: Installation of S-TEC yaw damper system, Model ST-238. - Applied: November 13, 1984 - Status date: May 20, 1998 - Product: Aircraft, Small Multi-Engine - Certification basis: Part 21 - Data sheets: [TCDS A7CE](https://openairdocs.org/tcds/A7CE) - Certificate PDF: https://openairdocs.org/files/sha256/84/83/848323210826b94c2f7a5e5650a9b8e43ad628d5f1ff0d7fc8cef113615bec1c - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3D6651D6904E3B2185256CC2001228A4.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA5362SW-D ## ADs that name it (0) None. ## Approved models (4) - Cessna Aircraft Company 414 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) - Cessna Aircraft Company 421 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) - Cessna Aircraft Company 421A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) - Cessna Aircraft Company 421B ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) ## 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: SA53625W-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 Civil Air Regulations. Original Product Typo Certificate Number: ATCE Make: CESSNA Model: 414, 421, 421A, and 421B Description of Type Design Change: Installation of S-TEC Yaw Damper System, Model ST-238, according to Bulletin No. 338, Revision 6, dated 5-15-98 and Master Drawing List No. 92298, Revision F, dated 5-15-98 or later FAA Approved revisions of the above data (28 Volt System). Also eligible on Cessna Model 414 when modified per STC SA2354SW, SA4379SW, or SA5998SW (RAM 325 H.P. Engine Conversion) (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: 11-13-84 Date Reissued: Date of Issuance: 12-06-84 Date Amended: 10-21-86, 3-16-87, 8-27-87, 2-28-91, 5-20-98, Revision 5 By Direction of the Administrator FEDERAL AVIATION (Signature) TOMINISTRATIO Michael Keirnan DAS Staff Coordinator, DAS 5 SW (Title) 47 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA5362SW-D, Revision 5 Limitations and Conditions: (con't.) 2. Also eligible on Cessna Model 414 when modified per STC SA8424SW (RAM 335 H.P. Engine Conversion). Also eligible on Cessna Model 414 When Modified Per STC SA2680SW (Riley 400 H.P. Engine Conversion). 4. Also eligible on Cessna Model 421B when modified per STC SA18NW (Robertson STOL). 5. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89559, dated 12-06-84 is required for Cessna Models 421B, S/N 421B0001 through S/N 421B0300 and the above model when modified in accordance with STC SA18NW (Robertson STOL Conversion) or later FAA Approved revisions of the above supplement. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89559-1, dated 10-21-86 is required for Cessna Models 421B, S/N 421B0001 through S/N 421B0300 and the above model when modified in accordance with STC SA18NW (Robertson STOL Conversion) or later FAA Approved revisions of the above supplement. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89559-2, dated 8-27-87 is required for Cessna Model 421B and when modified per STC SAINW (Robertson STOL Conversion) or later FAA Approved revisions of the above supplement. 8. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89733, dated 3-16-87 is required for Cessna Model 414 or later FAA Approved revisions of the above supplement. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89733-1, dated 8-27-87 is required for Cessna Model 414 and when modified per STC SA2354SW or SA4379SW (RAM 325 H.P. Engine Conversion) or later FAA Approved revisions of the above supplement. 10. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89918, dated 2-28-91 is required for Cessna Models 421 and 421A or later FAA Approved revisions of the above supplement. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 89733, Revision 2, dated 5-20-98 is required for Cessna Model 414 And When Modified Per STC SA2354SW, STC SA4379SW or STC SA5998SW (RAM 325 H.P. Engine Conversion) or STC SA8424SW (RAM 335 H.P. Engine Conversion) or later FAA Approved revisions of the above supplement United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number SAS362SW-D, Revision 5 FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891734, dated 5-20-98 is required for Cessna Model 414 When Modified Per STC SA2680SW (Riley 400 H.P. Engine Conversion) or later FAA Approved revisions of the above supplements. Compatibility of this modification with other previously approved modifications must be determined by the installer. 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 ) trom (Name of grantor) (Print or type) - (Address of grantor) (Number and street ) (City, State, and ZIP code ) Extent of Authority (if licensing agreement): Signature of grantor (In ink):. U.S. GOVERNMENT PRINTING OFFICE: 1966 OF OF-20S-S7S ## Every issue (1) - May 20, 1998: Amended, Current. [certificate](https://openairdocs.org/files/sha256/84/83/848323210826b94c2f7a5e5650a9b8e43ad628d5f1ff0d7fc8cef113615bec1c) --- 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.