# STC SA3900SW-D - Type: Supplemental type certificate - Status: Current, Amended - Holder: American Airlines Inc, United States - Description: Installation of Litton LTN-211 Omega Navigation System - Applied: September 3, 1980 - Status date: January 8, 1986 - Product: Aircraft, Large Airplane - Certification basis: Part 21 - Data sheets: [TCDS A3WE](https://openairdocs.org/tcds/A3WE) - Certificate PDF: https://openairdocs.org/files/sha256/0d/d5/0dd5fd39cfe7c548bad53e84fede8525acd14bc096cdb9d83c30fa41e42cb5dc - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/737874AAE8AAEB2C86257CF600653F5D.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA3900SW-D ## ADs that name it (0) None. ## Approved models (1) - The Boeing Company 727 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) ## What the certificate says This is OCR from the scanned FAA certificate. OCR can misread letters and numbers. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA390054-0 This certificate issued to: American Airlines, Inc. Maintenance & Engineering Center Tulsa, Oklahoma 74151 Purt 4b of the CIVIl Air Regulations. Original Product Type Certificate Numben: AWE Make: Boeing Murded: 721 Description of Type Design Change: Install Litton LIN-211 Omega Navigation System approved under TSO C94 in accordance with ECO's H 2661A dtd Oct 24, 1980, , H 26618 dtd Nov 12, 1980, H 2661C dtd Jan 19, 1981, H 2661D dtd Feb 25, 1981, H 2661E dtd Apr 24, 1981, H 2661F dtd June 23, 1981, H 2660 dtd Nov 14, 1980, H 2660A dtd Feb 27, 1981, H 2660B dtd Apr 3, 1981, H 2720 dtd Jan 29, 1981, H 2831 dtd Mar 24, | 1982, H 2831A dtd May 14, 1982, H 2880B dtd June 24, 1983, H 2880C dtd November 7, 1984, H2960A dated July 11, 1985 and H2994A dtd Jan. 8, 1986. The Omega Navigation System was designed to ARINC 599 characteristics and installed in imitatind and lnditioneera guide nes as outined (continued This approval should not be incorporated in any aircraft of this specific model on which other approved modifications are incorporated, unless it is determined that the interrelationship between this change and any of those previously incorporated approved modifications will not introduce any adverse effect upon the airworthiness of the aircraft. (Continued) Date of Application: September 3, 1980 Jule missued: Date of Issuance: FEDERAL October 26, 1980 AVIATION PAy direction $/20132,10/2183,1/4/85,8/3/85,1/8/86 Jate unended: 2/20/81, 3/12/81, 12/22/81, AlVaellen (Signature) PMINISTRAIO DAS-1SW Coordinator (Tille) 47. FAA FORM 8110-2 (10-68) STC4/1s United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number SA3900SW-D (Continuation) Description of Type Design Change: in AC 120-37. The installation provides for a single or dual Omega Navigation System (ONS) installed in either No. 1 and/or No. 2 position. Litton LTN-211 ONS/VLF with computer program No. 211-32-00 requires FAA approved American Airlines, Inc., AFM AAL Supplement No. 1 (D6-8728.3) dated October 26, 1980 and is approved in accordance with the accuracy requirements as outlined in AC Litton LTN-211 ONS/VLF with computer program No. 211-32-02 requires FAA approved American Airlines, Inc., AFM AAL Supplement No. 1 (D6-8727.43 for 727-35) dated June 9, 1981, or AFM AAL Supplement No. 2 (D6-8728.3 for 727-223) dated March 12, 1981 and is approved in accordance with the accuracy requirements as outlined in AC 120-33. Litton LTN-211 ONS/VLF with computer program No. 211-34-00 requires. FAA approvec American Airlines, Inc. AFM AAL Supplement No. 1 (D6-8721.49 for 727-123) dated May 20, 1982; or AFM AAL Supplement No. 2 (D6-8727.43 for 727-35) dated December 22, 1981, or AFM AAL Supplement No. 3 (DG-8728.3 for 727-223) dated December 22, 1981, and is approved in accordance with the accuracy requirements as outlined in AC 120-33. Litton LTN-211 ONS/VLF with computer program No. 211-34-02 requires FAA approved American Airlines, Inc. AFM AAL Supplement No. 2 (D6-8727.49 for 727-123), or AFM AAL Supplement No. 3 (D6-8727.43 for 727-35) or AFM AAL Supplement No. 4 (D6-8728.3 for 727-223) or AFM AAL Supplement No. 1 (D6-8727.3 for 727-23), dated October 21, 1983, and is approved in accordance with the accuracy requirements as outlined in AC120-33. Litton LTN-211 ONS/VLF with computer program No. 211-34-03 requires FAA approved 002297 American Airlines, Inc. AFM AAL Supplement No. 3 (D6-8727.49 for 727-123), or AFM AAL Supplement No. 4 (D6-8727.43 for 727-35), or AFM AAL Supplement No. 5 (D6-8728.3 for 727-223), or AFM AAL Supplement No. 2 (D6-8727.3 for 727-23), dated January 4, 1985, and is approved in accordance with the accuracy requirements as outlined in AC120-33. 47 STC#4/jb PAGE OF ZAGES TRANSFER ENDORSEMENT 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) Exent of Authority (if licensing agreement) : Signature of grantor (1n ink) : ## Every issue (1) - January 8, 1986: Amended, Current. [certificate](https://openairdocs.org/files/sha256/0d/d5/0dd5fd39cfe7c548bad53e84fede8525acd14bc096cdb9d83c30fa41e42cb5dc) --- 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.