# STC SA1938NW-D - Type: Supplemental type certificate - Status: Current, Reissued - Holder: United Airlines Inc, United States - Description: Replaces existing wiring in the sailboat upper and lower pylon areas with high strength, nickel-plated, Teflon insulated wire and adds electrical disconnects in the leading edge ribs just inboard of each pylon in accordance with DAS-1-WE Approved United Air Lines Drawing List No. 1938 dated April 1, 1988, or later FAA approved revisions. - Applied: July 7, 1983 - 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/f5/72/f57227d89d41d2e7f1e9df994a5f007cca932493e413489328f0b5030217f252 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3946395B55BE3E738625799E00581C88.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA1938NW-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 Regulations. (See Type Certificate Data Sheet A20WE for special conditions.) Original Product Type Certificate Number : A20WE Make: Boeing Model: 747-100 Series Description of Type Design Change: Replaces existing wiring in the sailboat upper and lower pylon areas with high strength, nickel-plated, Teflon insulated wire and adds el ectrical disconnects in the leading edge ribs just inboard of each pylon in accordance with DAS-1-WE Approved Un ited Air Lines Drawing List No. 1938 dated April 1, 1988, or later FAA approved revisions. Limitations and Conditions : The approval of this change in type d esign applies basically to 747-100 Series only. This approval should not be extended to other aircra ft 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 approved modificati ons will introduce no adverse effect upon the airworthiness of that aircraft. This determination should include consideration of significan t changes in weight distribution such as an increase in the fixed disposable weight in the fu selage. A copy of this STC must be included in the permanent records of the modified 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. Date of application : November 7, 1983 Date of issuance : December 19, 1983 Date reissued : November 30, 2011 Date amended : April 1, 1988 ( Signature) Haifa Haj-Eid Supervisor, Technical & Administrative Support Staff Los Angeles Aircraft Certification Office (Title) Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIP Code) from (Name of grantor) (Print or type) (Address of grantor) (Number and street) (City, State, and ZIP Code) Signature of grantor (In ink): U.S. GPO 1987-763-28 ## Every issue (1) - November 30, 2011: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/f5/72/f57227d89d41d2e7f1e9df994a5f007cca932493e413489328f0b5030217f252) --- 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.