# STC SA1937NW-D - Type: Supplemental type certificate - Status: Current, Reissued - Holder: United Airlines Inc, United States - Description: Air data system is revised by installation of a Digital Air Data Computer, Honeywell, P/N HG480B20, in the NO. 1 position. - Applied: May 31, 1983 - Status date: November 30, 2011 - Product: Aircraft, Large Multi-Engine - Certification basis: Part 21, Part 25 - Data sheets: [TCDS A16WE](https://openairdocs.org/tcds/A16WE) - Certificate PDF: https://openairdocs.org/files/sha256/31/95/3195924d148accad0974785a14c38a950fb8f48670495d3075d25f17446a9279 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/216FF108A95E55D9862579CE0057FF3D.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA1937NW-D ## ADs that name it (0) None. ## Approved models (1) - The Boeing Company 737-100 Series ([TCDS A16WE](https://openairdocs.org/tcds/A16WE)) ## 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. United States Of America Department of Transportation - Federal Aviation Administration Supplemental Type Certificate This certificate has been reissued to replace the original certificate reported as lost. This Certificate issued to United Air Lines, Inc. 600 Jefferson Street Houston, Texas 77002 Part 25 of the Federal Aviation RlOriginal Product Type Certificate Number : A16WE Boeing 737-130 Description of Type Design Change: The air data system is revised by the installation of a Digital Air Data Computer, Honeywell P/N HG480B20, in the No. 1 position in accordance with United Air Lines, DAS-1-WE, Approved Drawing List No. 1937, dated June 28, 1983, or later approved revisions. Limitations and Conditions: This approval should not be extended to the aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change a nd any of those other previously approved modifications will introduce no adverse effect upon th e airworthiness of that aircraft. 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: May 31, 1983 Date of issuance: June 28, 1983 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/sha256/31/95/3195924d148accad0974785a14c38a950fb8f48670495d3075d25f17446a9279) --- 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.