# STC SA1946NW-D - Type: Supplemental type certificate - Status: Current, Reissued - Holder: United Airlines Inc, United States - Description: Dual class seat mix change - increase coach section capacity from 165 passengers to 174 passengers. Installation in accordance with United Air Lines, DAS-1-WE, Drawing List No. 1946 dated August 16, 1984, or later FAA approved revisions. - Applied: July 24, 1984 - 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/ad/04/ad045d5cdb194f807198a64084aed1562c00c1861358bbb995b499a8e7eb7324 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A4E85AA15C17A4CC8625799E0063DBB5.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA1946NW-D ## ADs that name it (0) None. ## Approved models (1) - The Boeing Company DC-8-71 ([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. This Certificate issued to United Air Lines, Inc. 600 Jefferson Street Houston, Texas 77002 Part 4b of the Civil Air Regulations. (See Type Certificate Data Sheet 4A25.) Original Product Type Certificate Number : 4A25 Make: Boeing Model: DC-8-71 Description of Type Design Change : Dual class seat mix change – incr ease coach section capacity from 165 passengers to 174 passengers. Installation in accordance with United Air Lines, DAS-1-WE, Drawing List No. 1946 dated August 16, 1984, or later FAA approved revisions. Limitations and Conditions : The approval of this change in type d esign applies basically to DC-8-71. This approval should not be extended to other aircraft of th is model on which other previ ously approved modifications are incorporated unless it is determined by the installer th at the interrelationship betwee n this change and any of those other previously approved modifications will intr oduce no adverse effect upon the airworthiness of that aircraft. This 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 person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission. Date of application : July 24, 1984 Date of issuance : August 10, 1984 Date reissued : November 30, 2011 ( Signature) Haifa Haj-Eid Supervisor, Technical & Administrative Support Staff Los Angeles Aircraft Certification Office ( Title) 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 and street) (City, State, and ZIP Code) Signature of grantor (In ink): U.S. GPO 1987-763-28 ## Every issue (1) - November 30, 2011: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/ad/04/ad045d5cdb194f807198a64084aed1562c00c1861358bbb995b499a8e7eb7324) --- 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.