# STC SA2753NM-D - Type: Supplemental type certificate - Status: Current, Reissued - Holder: United Airlines Inc, United States - Description: Add 12 coach seats in E-Zone, reducing the seat pitch from 34 to 31 inches throughout most of the Zone, and 6 coach seats in C & D Zones, reducing the seat pitch from 34 t o 31 inches in the outboard rows. PSU's are repitched as required. These installations will be done according to United Airlines DAS-1-WE Approved Master Drawing List #2753, dated July 3, 1989, or later FAA approved revisions. - Applied: June 19, 1989 - Status date: November 30, 2011 - Product: Aircraft - Certification basis: Part 21, Part 25 - Data sheets: [TCDS A20WE](https://openairdocs.org/tcds/A20WE) - Certificate PDF: https://openairdocs.org/files/sha256/2c/e7/2ce72cf773f12bf8cf6d05a1ec4346cac7ed1f9207a2cf3323bb1cebf47014ae - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/115650931DA526F786257995006F7FC1.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA2753NM-D ## ADs that name it (0) None. ## Approved models (1) - The Boeing Company 747-100 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 R lOriginal Product Type Certificate Number : A20WE The Boeing Company 747-100 Series Description of Type Design Change : Add 12 coach seats in E-Zone, reducing the seat pitch from 34 to 31 inches throughout most of the Zone, and 6 coach seats in C & D Zones, reducing the seat pitch from 34 t o 31 inches in the outboard rows. PSU’s are repitched as required. These installations will be done according to United Airlines DAS-1-WE Approved Master Drawing List #2753, dated July 3, 1989, or later FAA approved revisions. Limitations and Conditions: This approval should not be exte nded to other aircraft of this model on which other previously approved m odifications are incorporated unless it is determined by the installer that the interrelati onship between this change and any of those previously approved modifications will introdu ce no adverse effect upon the airworthiness of that aircraft. This determination should include consideration of signifi cant changes in weight distribution such as an increase in the fixed dis posable weight in the fuselage. If the holder agrees to permit another person to use this certif icate 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 19, 1989 Date of issuance: July 3, 1989 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/sha256/2c/e7/2ce72cf773f12bf8cf6d05a1ec4346cac7ed1f9207a2cf3323bb1cebf47014ae) --- 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.