# STC SA2823WE-D - Type: Supplemental type certificate - Status: Current, Reissued - Holder: United Airlines Inc, United States - Description: Installation of equipment required to conduct NASA/UAL global air sampling program. (747SP SERIES -122) (747-121) - Applied: June 7, 1974 - Status date: November 30, 2011 - Product: Aircraft, Large Multi-Engine - Certification basis: Part 21, Part 25 - Data sheets: [TCDS A20WE](https://openairdocs.org/tcds/A20WE) - Certificate PDF: https://openairdocs.org/files/sha256/30/53/305376022dff1c13f2a451fa00cf21c8c79f90499b11b3b525ad4fb9b1a5ec87 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/135FDCA0A78903C4862579CE0058214E.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA2823WE-D ## ADs that name it (0) None. ## Approved models (3) - The Boeing Company 747-100 Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE)) - The Boeing Company 747-100B Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE)) - The Boeing Company 747SP Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE)) ## 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 25 of the Federal Aviation Regulations dated December 31, 1953. A20WE Boeing 747-122, 747-121, 747-238B, 747-SP-21 Description of Type Design Change: Installation of equipment required to conduct NASA/United Air Lines Global Air Sampling Program. Equipment installed according to COA 8-1540 and Master Drawing List dated January 8, 1975 or later FAA approved revision. Limitations and Conditions: This approval is limited to 747 model airplanes as listed above. 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 inter-relationship between this change and any other previously approved modifications will introduce no adverse effect on 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 7, 1974 Date of issuance: December 10, 1974 Date reissued: November 30, 2011 Date amended: November 25, 1975, April 6, 1976 ( 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 (2) - November 30, 2011: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/30/53/305376022dff1c13f2a451fa00cf21c8c79f90499b11b3b525ad4fb9b1a5ec87) - June 4, 1976: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/93/9e/939e7ca33e3622bd89b655f1b27692bfc4d18c68cf66ead13d9f812a475ea312) --- 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.