# STC SA5516NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Northrop Grumman Systems Corporation, United States
- Description: Intallation of three (3) Litton LTN-92 inertial naviation systems (INS).
- Applied: December 4, 1990
- Status date: February 22, 2016
- Product: Aircraft, Large Airplane
- Certification basis: Part 21, Part 25
- Data sheets: [TCDS A20WE](https://openairdocs.org/tcds/A20WE)
- Certificate PDF: https://openairdocs.org/files/sha256/0c/db/0cdbdfd1474ec248a7e43fa1a4948aec50bd05a731d9c379d58b385155da715f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C0DD9FBCB1B8F6A486257F6B00634536.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA5516NM

## ADs that name it (0)

None.

## Approved models (3)

- The Boeing Company 747-200B Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))
- The Boeing Company 747-200C Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))
- The Boeing Company 747-200F Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))

## 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, CA 91367-6675 Part 25* of the Federal Aviation Regulations.

(For Certification Basis see T.C. Data Sheet No. A20WE.)

A20WE

The Boeing Company

747-200 Series Description of Type Design Change: Installation of three (3) Litton LTN-92 Inertial Navigation Systems (INS) in accordance with FAA approved Litton Top Installation Drawing 454065-06, Revision B, or later FAA approved revision of this drawing.

Litton Airplane Flight Manual Supplement 464081, Revision N/C, FAA approved on January 9, 1992, or later FAA approved revision, is required as part of this modification.

Limitations and Conditions : The approval of these changes in type design appl ies only to the above listed aircraft model when a triple Litton LTN -92 INS replaces a T.C. approved triple Delco Carousel C -IV INS installation. This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated unless it is found 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 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.

Date of application : December 4, 1990

Date of issuance : January 16, 1992

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/sha256/0c/db/0cdbdfd1474ec248a7e43fa1a4948aec50bd05a731d9c379d58b385155da715f)
- March 30, 2015: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/41/e7/41e72a648d0b392f36b54171b0d12ba3b9bec1980ad6987439692d7386df6d68)

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