# STC SA3593WE-D - Type: Supplemental type certificate - Status: Current, Reissued - Holder: United Airlines Inc, United States - Description: Seat mix change from 26 F/C and 156 coach passenger configuration to 26 F/C and 164 coach passenger configuration. - Applied: September 5, 1979 - Status date: November 30, 2011 - Product: Aircraft, Large Multi-Engine - Certification basis: Part 21 - Data sheets: [TCDS 4A25](https://openairdocs.org/tcds/4A25) - Certificate PDF: https://openairdocs.org/files/sha256/3f/0e/3f0e29eeb705019585be5e8d34fc86dac6d17c99320b9c3c2a32006a35239459 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FF3878FDA6BAF4F786257998005874C2.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA3593WE-D ## ADs that name it (0) None. ## Approved models (1) - The Boeing Company DC-8-61 ([TCDS 4A25](https://openairdocs.org/tcds/4A25)) ## 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. 600 Jefferson Street Houston, Texas 77002 Part 4b of the Civil Air Regulations. (See Type Certificate Data Sheet 4A25). 4A25 Boeing DC-8-61 Description of Type Design Change: Seat mix change from 26 F/C and 156 coach passenger configuration to 26 F/C and 164 coach passenger configur ation. Installation is in accordance with United Air Lines DAS-1-WE Drawing List No. 3593 date d September 28, 1979, or later FAA approved revisions.. Limitations and Conditions: The approval of this change in type design applies basically to the DC-8-61 aircraft only. This approval shoul d not be extended to other aircra ft of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any of those other previ ously approved modifications will introduce no adverse effect upon the airworthiness of that aircraft. Th is determination should in clude consideration of significant changes in weight distribution such as an increase in the fixed disposable weight in the fuselage. If the holder agrees to permit another pers on to use this certificate to alter the product, the holder shall give the other person written evidence of that permission. This certificate and the supporting data, which is the basis for approval, shall remain in effect until surrendered, suspended, revoked or a termination date is otherwise established by the Administrator of the Federal Aviation Administration. Date of application: September 5, 1979 Date of issuance: January 21, 1980 Date reissued: November 30, 2011 ( Signature) Haifa Haj-Eid Supervisor, Technical & Administrative Support Staff, Los Angeles Aircraft Certification Office ( Title) NOTE: **DO NOT DELETE THIS PAGE.** **DO NOT ADD ANY DATA TO THIS PAGE.** **THIS PAGE IS FOR PAGE NUMBERING PURPOSES, PLEASE DISCARD PRINTED COPY.** ## Every issue (1) - November 30, 2011: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/3f/0e/3f0e29eeb705019585be5e8d34fc86dac6d17c99320b9c3c2a32006a35239459) --- 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.