# STC SA3439WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Northrop Grumman Systems Corporation, United States
- Description: Installation of single or dual Litton LTN-51 inertial navigation systems.
- Applied: July 19, 1977
- Status date: April 12, 2016
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A5EU](https://openairdocs.org/tcds/A5EU)
- Certificate PDF: https://openairdocs.org/files/sha256/93/ae/93aee7bce667824b0feeecc75a53ea0f3492af76aa5bb8a3d2f75b065dd63e67
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4E071A828F670B9086257FA20064879A.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3439WE

## ADs that name it (0)

None.

## Approved models (1)

- Airbus BAC 1-11 400 Series ([TCDS A5EU](https://openairdocs.org/tcds/A5EU))

## 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.

This Certificate issued to Northrop Grumman Systems Corporation 21240 Burbank Blvd.

Woodland Hills, California 91367-6675 Part 4b of the Civil Aviation Regulations (Certification Basis is set forth in Type Certificate Data Sheet A5EU) Original Product Type Certificate Number :

A5EU British Aircraft Corporation BAC 1-11, 400 Series

Description of Type Design Change: Installation of single or dual Litton LTN-51 Inertial Navigation System(s) in accordance with FAA sealed Litton Top Drawing No. 454054-06, Revision “B”, or later FAA sealed revision.

Litton Airplane Flight Manual Supplement 2 to BAC 1-11 Model 400 Series, FAA approved on July 22, 1977, or later FAA approved revision is required as part of this modification.

Limitations and Conditions: The approval of this change in Type Design applies only to the above listed aircraft when modified by STC SA1740SW. This approval should not be extended to other aircraft of this model 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. 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 19, 1977

Date of issuance : July 22, 1977

Date reissued : April 12, 2016

(Signature) Supervisor, Technical & Administrative Support Staff (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.**

Number (STC No.)

## Every issue (1)

- April 12, 2016: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/93/ae/93aee7bce667824b0feeecc75a53ea0f3492af76aa5bb8a3d2f75b065dd63e67)

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