# STC SA2824WE-D - Type: Supplemental type certificate - Status: Current, Reissued - Holder: United Airlines Inc, United States - Description: Installation of dual Delco C-IV inertial navigation systems. - Applied: June 17, 1974 - 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/eb/3a/eb3a385d201d6c93843ef93f07c35146730c7ddab092f5c954d2fb9d55f03605 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EA05508E6807BC7E862579CE00583CE3.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA2824WE-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. This Certificate issued to United Air Lines, Inc. 600 Jefferson Street Houston, Texas 77002 Part 4b of the Civil Air Regulations dated December 31, 1953 and amended July 5, 1966. 4A25 Boeing DC-8-61 Description of Type Design Change: Installation of dual Delco C-IV Inertial Navigation Systems in accordance with COA 2-4514 and Master Drawing List. Limitations and Conditions: This approval is limited to DC-8-61 airplanes. This approval should not be extended to other specific airplanes 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 previously approved modifications will introduce no adverse effect upon the airworthiness of that airplane. 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. 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: June 17, 1974 Date of issuance: January 22, 1975 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/eb/3a/eb3a385d201d6c93843ef93f07c35146730c7ddab092f5c954d2fb9d55f03605) --- 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.