# STC SA3769NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Northrop Grumman Systems Corporation, United States
- Description: Installation of a single Litton LTN-311 Omega/VLF Navigation System
- Applied: September 25, 1987
- Status date: February 22, 2016
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A3WE](https://openairdocs.org/tcds/A3WE)
- Certificate PDF: https://openairdocs.org/files/sha256/7b/ca/7bca0883ceb1304e093bc4d5fa57a9a730d6d37066982b1897d6561b99ee5a68
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1D0B3817DF4CD17B86257F6B00622861.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3769NM

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 727-200 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.

United States Of America Department of Transportation - Federal Aviation Administration Supplemental Type Certificate This certificate has been reissued to replace the original certificate reported as lost.

Number SA3769NM

This Certificate issued to

Part 4b of the Civil Air Regulations Regulations. (See T.C. Data Sheet A2WE)

Description of Type Design Change: Installation of a single Litton LTN-311 Omega/VLF Navigation System in accordance with Litton with FAA sealed Litton Systems, Inc. Top Drawing No. 454011-11, Revision “B”, dated June 6, 1988, or later FAA sealed revision of this drawing.

Litton Systems, Inc. Airplane Flight Manual Supplement, Document No. 464570, Revision N/C, FAA approved on August 10, 1988, or later FAA approved revision is required as part of this installation.

Limitations and Conditions: The approval of this change in type design applies basically to the above noted airplane model series only. This installation should not be incorporated in any aircraft unless it is determined that the interrelationship between this change and any previously approved configuration will not introduce any 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 person written evidence of that permission.

Northrop Grumman Systems Corporation 21240 Burbank Blvd.

Woodland Hills, CA 91367-6675 A3WE

The Boeing Company

727-2J0 Original Product Type Certificate Number :

Date of application : September 25, 1987

Date of issuance : August 22, 1988

Date reissued : March 30, 2015, February 22, 2016

(Signature) Supervisor, Technical & Administrative Support Staff, Los Angeles Aircraft Certification Office

(Title)

## Every issue (2)

- February 22, 2016: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/7b/ca/7bca0883ceb1304e093bc4d5fa57a9a730d6d37066982b1897d6561b99ee5a68)
- March 30, 2015: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/14/64/146487b9286de564cf1233194dca494293254b1fdfe11fd34772ad6c54808ba4)

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