# STC SA4-1466 - Type: Supplemental type certificate - Status: Current, Reissued - Holder: United Airlines Inc, United States - Description: Conversion of DC-6B interior from coach to first class arrangement per United Air Lines Drawing 15F-1800 change "C". - Applied: March 16, 1961 - Status date: November 30, 2011 - Product: Aircraft, Large Multi-Engine - Certification basis: Part 21 - Data sheets: [TCDS 6A4](https://openairdocs.org/tcds/6A4) - Certificate PDF: https://openairdocs.org/files/sha256/ce/bf/cebf036dbeaaec2c3c33ee6ff7e6e0e61525e86e34c3c55c21a53eb09660a340 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BA8BF34D124BD765862579910075A6E4.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA4-1466 ## ADs that name it (0) None. ## Approved models (1) - The Boeing Company DC-6B ([TCDS 6A4](https://openairdocs.org/tcds/6A4)) ## 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 7702 Part 4b of the Civil Air Regulations Original Product Type Certificate Number : 6A4 Boeing DC-6B Description of Type Design Change: Conversion of DC-6B interior from coach to first class arrangement per United Air Lines Drawing 15F-1800 change “C”. Limitations and Conditions: The approval of change in the design applies basically to the model DC-6B only. This approval should not be extended to other specific aircraft 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. If th e 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. 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: March 16, 1961 Date of issuance: March 12, 1961 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/ce/bf/cebf036dbeaaec2c3c33ee6ff7e6e0e61525e86e34c3c55c21a53eb09660a340) --- 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.