# STC SA3486WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Northrop Grumman Systems Corporation, United States
- Description: Installation of dual Litton LTN-51, or dual Litton LTN-72, or one Litton LTN-51 and one Litton LTN-72 Inertial Navigation Systems
- Applied: July 13, 1977
- Status date: April 12, 2016
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 4A26](https://openairdocs.org/tcds/4A26)
- Certificate PDF: https://openairdocs.org/files/sha256/36/38/36384d77ca3f0d3ecddb1b08cbb1ba7db2d7ca99fb94c7542461f9b7c05f574c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/799D63B013102F8986257FA1006CCCEB.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3486WE

## ADs that name it (0)

None.

## Approved models (4)

- The Boeing Company 707-300 Series ([TCDS 4A26](https://openairdocs.org/tcds/4A26))
- The Boeing Company 707-300B Series ([TCDS 4A26](https://openairdocs.org/tcds/4A26))
- The Boeing Company 707-300C Series ([TCDS 4A26](https://openairdocs.org/tcds/4A26))
- The Boeing Company 707-400 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.

FAA Form 8110-2(10-68) Page 1 of 2 Number SA3486WE This Certificate issued to Northrop Grumman Systems Corporation 21240 Burbank Blvd.

Woodland Hills, CA 91367-6675

Part 4b of the Civil Air Regulations Original Product Type Certificate Number :

4A26

Boeing

707-300 Series, 707-400 Series, 707-300B Series, 707-300C Series Description of T ype Design Change : Installation of dual Litton LTN -51, or dual Litton LTN -72, or one Litton LTN-51 and one Litton LTN -72 Inertial Navigation Systems in accordance with FAA approved Litton Top Drawing No. 452853-07 Revision “D” or later FAA approved revision.

Litton Airplane Flight Manual Supplement to Boeing 707 -300 Series, 707- 400 Series, 707- 300B Series, 707- 300C Series, FAA approved on September 14, 1977, or later FAA approved revision is required as part of this installation.

Limitations and Condit ions: The approval of this change in type design applies basically to the above listed airplane models only. This approval should not be extended to other aircraft of these models 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 modifications will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this certificate must be maintain ed as part of the permanent records for 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: July 13, 1977

Date of issuance: November 3, 1977

Date reissued: April 12, 2016

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

NOTE:

**DO NOT DELETE THIS PAGE.**

**DO NOT ADD ANY DATA TO THIS PAGE.**

**THIS PAGE IS FOR PAGE NUMBERING PURPOSES, PLEASE DISCARD PRINTED COPY.**

## Every issue (1)

- April 12, 2016: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/36/38/36384d77ca3f0d3ecddb1b08cbb1ba7db2d7ca99fb94c7542461f9b7c05f574c)

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