# STC SA2808WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Northrop Grumman Systems Corporation, United States
- Description: Installation of dual Litton LTN-72 inertial navigation system
- Applied: January 16, 1974
- Status date: February 22, 2016
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 4A26](https://openairdocs.org/tcds/4A26)
- Certificate PDF: https://openairdocs.org/files/sha256/f8/f4/f8f4fce271b1a84754d0b3ef0490b0044ae7a9acdddfb0fbd57747b45b157b11
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/320BA00E6DD1384F86257F6B0061322A.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2808WE

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 707-300C Series ([TCDS 4A26](https://openairdocs.org/tcds/4A26))

## 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 SA2808WE

This Certificate issued to

Part 4b of the Civil Air Regulations Regulations. (See T.C. Data Sheet 4A26)

Description of Type Design Change: Installation of dual LTN-72 Inertial Navigation System in accordance with Litton Top Drawing No. 452853-02 N/C, or later FAA Approved revisions.

Litton Systems Supplementary Revisions to the FAA Approved Airplane Flight Manual Report No. D6-1587.47-707-386C dated February 7, 1974, 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 4A26

Boeing

707-386C Original Product Type Certificate Number :

Date of application : January 16, 1974

Date of issuance : February 7, 1974

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

Date amended : August 9, 1996

(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/f8/f4/f8f4fce271b1a84754d0b3ef0490b0044ae7a9acdddfb0fbd57747b45b157b11)
- March 30, 2015: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/81/a0/81a0c1c84cd672f345d75a077b412e36124942fbcff7414ba030590e0d21c3cb)

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