# STC ST00007LB-D - Type: Supplemental type certificate - Status: Current, Reissued - Holder: United Airlines Inc, United States - Description: Modifies the aircraft to install a one way check valve in the yaw damper actuator hydraulic return port. The installation is in accordance with DAS-1-WE Approved United Air Lines Drawing List No. 00007 dated June 1, 1995, or later approved FAA revisions. - Applied: October 10, 1994 - Status date: November 30, 2011 - Product: Aircraft, Large Multi-Engine - Certification basis: Part 21, Part 25 - Data sheets: [TCDS A2NM](https://openairdocs.org/tcds/A2NM) - Certificate PDF: https://openairdocs.org/files/sha256/e1/b2/e1b29ac47652ce2dded143fcb0eabe617421caa2d925f5070b942b0252f7df3d - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E8A3E7EDA0F428C386257995006624D8.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/ST00007LB-D ## ADs that name it (0) None. ## Approved models (1) - The Boeing Company 757-200 Series ([TCDS A2NM](https://openairdocs.org/tcds/A2NM)) ## 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. See Type Certificate Data Sheet A2NM for Special Conditions. A2NM Boeing 757-200 Series Description of Type Design Change : Modifies the aircraft to insta ll a one way check valve in the yaw damper actuator hydraulic return port. The in stallation is in accordance with DAS-1-WE Approved United Air Lines Drawing List No. 00007 dated June 1, 1995, or later approved FAA revisions. Limitations and Conditions: Approval of this installation applies to all 757-200 series aircraft. This approval does not extend to other aircraft of this model on which othe r previously approved modifications are incorporated unless it is determined by the installer that this interrelationship between this change and any of those other previously a pproved modifications will introduce no adverse affect upon the airworthiness of that aircraft. If the holder ag rees 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: October 10, 1994 Date of issuance: June 1, 1995 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/e1/b2/e1b29ac47652ce2dded143fcb0eabe617421caa2d925f5070b942b0252f7df3d) --- 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.