# STC ST00022LB-D - Type: Supplemental type certificate - Status: Current, Reissued - Holder: United Airlines Inc, United States - Description: Modifies the aircraft to replace the existing Delco inertial navigation systems with Litton LTN92 inertial navigation systems for RNP10 operations. - Applied: January 23, 1998 - 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/sha256/47/df/47dfe1c8d7ff9333bac529e35e6d16f0b872978e17a61070b6e8b8e7aaf75e9f - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F58431FC22CE0711862579A6004CACA4.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/ST00022LB-D ## ADs that name it (0) None. ## Approved models (3) - The Boeing Company 747-200B Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE)) - The Boeing Company 747-200C Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE)) - The Boeing Company 747-200F 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. See Type Certificate Data Sheet A20WE for Special Conditions. A20WE Boeing 747-238B Description of Type Design Change: Modifies the aircraft to replace the existing Delco Inertial Navigation Systems with Litton LTN92 Inertial Navigation System s for RNP10 operations. The installation is in accordance with DAS-1-WE Approved United Air Lin es Document List No. 00022, dated April 15, 1998. United Air Lines AFM Supplement dated April 15, 1998, or later FAA approved revisions to FAA Approved Flight Manual No. D6-13703.322 is required for this modification. Limitations and Conditions: The approval of this installation applies to the 747-238B series only. This approval should not extended to other aircraft of this model on which other previously approved modifications are incorporated unless it is determined by the installer that the interrelationship between this change and any of those other previously a pproved modifications will introduce no adverse effect 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: January 23, 1998 Date of issuance: April 15, 1998 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/sha256/47/df/47dfe1c8d7ff9333bac529e35e6d16f0b872978e17a61070b6e8b8e7aaf75e9f) --- 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.