# STC SA3130WE - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Northrop Grumman Systems Corporation, United States - Description: Installation of a single or dual Litton LTN-72 INS or a single or dual LTN-72R INS/RNAV navigation system - Applied: December 8, 1975 - Status date: April 12, 2016 - Product: Aircraft, Large Airplane - Certification basis: Part 21 - Data sheets: [TCDS A3WE](https://openairdocs.org/tcds/A3WE) - Certificate PDF: https://openairdocs.org/files/sha256/6f/9f/6f9fc863c3a482c3a65ae87a1009ac02db5c59ebb5239461c697ec3dd4eb4e10 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/13D5259465B6245086257FA2006BA680.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA3130WE ## ADs that name it (0) None. ## Approved models (4) - The Boeing Company 727 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) - The Boeing Company 727-100 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) - The Boeing Company 727-100C Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) - The Boeing Company 727C Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) ## 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. Number SA3130WE This Certificate issued to Northrop Grumman Systems Corporation 21240 Burbank Blvd. Woodland Hills, CA 91367-6675 Part 4b* of the Civil Air Regulations. (See Type Certificate Work Sheet No. A3WE dated May 1, 1976.) A3WE Boeing 727 Series, 727-100 Series, 727C Series, 727-100C Series Description of Type Design Change (See continuation sheet for description of type design change.) Limitations and Conditions: The approval of this change in Type Design applies basically to the above listed only to Boeing Model Airplanes only. This approval should not be extended to other aircraft of this model on which other approved previously approved modifications are incorporated unless it is found by the installer that the interrelationship between this chang e and any of those previously approved modifications will introduce no adverse effect upon the airworthiness of the aircraft . If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other perso n written evidence of that permission. Date of application : December 8, 1975 Date of issuance : March 12, 1976 Date reissued : April 12, 2016 Date amended : May 18, 1977 (Signature) Supervisor, Technical & Administrative Support Staff Los Angeles Aircraft Certification Office (Title) Number SA3130WE May 18, 1977 Description of Type Design Change Installation of a single or dual Litton LTN-72 INS or a single or dual LTN-72R INS/RNAV navigation system in accordance with one of the following: (1) Litton LTN-72 INS Installation FAA sealed Litton Top Installation Drawing No. 454011-03, Rev. “C”, dated March 4, 1976, or later sealed revision. Litton Systems, Inc., FAA Approved Airplane Flight Manual Supplement No. 6 approved on Mach 12, 1976, or Airplane Flight Manual Supplement No. 7 approved on May 18, 1977, or later approved revision to Boeing Airplane Flight Manual Document D6-8727, is required as part of this installation. (2) Litton LTN-72R INS/RNAV Installation FAA sealed Litton Top Installation Drawing No. 454011-04, “B” Revision dated April 25, 1977, or later sealed revision. Litton Systems, Inc., Airplane Flight Manual Supplement No. 8 approved on May 18, 1977, or later approved revisions to Boeing Airplane Flight Manual Document D6-8727, is required as part of this modification. ## Every issue (1) - April 12, 2016: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/6f/9f/6f9fc863c3a482c3a65ae87a1009ac02db5c59ebb5239461c697ec3dd4eb4e10) --- 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.