# STC SA3790SW - Type: Supplemental type certificate - Status: Current, Issued - Holder: Comtran, Ltd, United States - Description: Installation of naviagation/ instrumentation switching system - Applied: July 3, 1986 - Status date: June 5, 1987 - Product: Aircraft, Large Airplane - Certification basis: Part 21 - Data sheets: [TCDS 4A26](https://openairdocs.org/tcds/4A26) - Certificate PDF: https://openairdocs.org/files/sha256/2d/7a/2d7ae2b1a73b0d3f7f4b8052d64514178e3d7990c2cbe41acc59e9b13c36173b - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F254EC257374C78285256CC2000C5A7F.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA3790SW ## ADs that name it (0) None. ## Approved models (1) - The Boeing Company 707-300 Series ([TCDS 4A26](https://openairdocs.org/tcds/4A26)) ## 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. <-/i&246t&&&n&. Hnited States of America Bepartment of transportation—federal 3toiation administration supplemental 'Cuje Certificate tyiMmvW' SA3790SW P/N 190-478 CHW-191 Goratran, Ltd. 243 Central Park Mall San Antonio, Texas 78216 W^i^ 4b ^/^e, CiVll AJXf / 4A26 707-321 Installation of Navlgaticw/Instojraentation Switching System in accooiance vdtih OQfeitran Drawing List 707L004 revisicsi B dated 3/13/87, or later ERA approved revision. EAA Approved Airplane Flight Manual Supplement dated June 5, 1987, is required. Ccrapatibility of this modification with other previously approved raodifications must be determined by the installer. ^fi^.&e<>diL&t?^Jcia^&^t^^ n^ —f/& July 3, 1986 June 5, 1987 L. B. Andriesen (Signature) Manager, Aircraft Certification Division Southwest Region (Title) FAAFoBM 81 10-2 (10-68) TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ^IP code) from (Name of grantor) (Print or type) (Address of grantor) (Number and street) (City, Slate, and <7P code) Extent of Authority (if licensing agreement): Signature of grantor (In ink): ## Every issue (1) - June 5, 1987: Issued, Current. [certificate](https://openairdocs.org/files/sha256/2d/7a/2d7ae2b1a73b0d3f7f4b8052d64514178e3d7990c2cbe41acc59e9b13c36173b) --- 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.