STC SA3486WE

Supplemental type certificate · Northrop Grumman Systems Corporation

Holder
Northrop Grumman Systems Corporation · United States
Status
Current · Reissued
Status date
April 12, 2016
Applied
July 13, 1977
Product
Aircraft · Large Airplane
Certification basis
Part 21
Data sheet
TCDS4A26

From FAA DRS, with our copy of the certificate PDF. DRS record last changed December 6, 2025.

What it approves

Installation of dual Litton LTN-51, or dual Litton LTN-72, or one Litton LTN-51 and one Litton LTN-72 Inertial Navigation Systems

What the certificate says

From the PDF’s text layer, without the form’s printed wording. Layout and order may 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.

ADs that name this STC · 0

An AD can apply because an STC is installed, or mention one in its text.

No AD in this release names this STC

Approved models · 4

MakeModelData sheet
The Boeing Company707-300 Series4A26
The Boeing Company707-300B Series4A26
The Boeing Company707-300C Series4A26
The Boeing Company707-400 Series4A26