# STC SA8027NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Northrop Grumman Systems Corporation, United States
- Description: Replacement of 3 Litton LTN-72/72R INSs with 3 LTN-92 INSs. (747-287)
- Applied: June 9, 1994
- Status date: April 12, 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/sha256/37/f6/37f693106c8274f4e0ab284102bc2ea5ba95897da4736c9ab75bd17f3376c725
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F8EEC94584C2583F86257FA2006C6911.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA8027NM

## 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, California 91367-6675 Part 25 of the Federal Aviation Regulations *(For certification basis see T.C. Data Sheet A22WE) Original Product Type Certificate Number :

A22WE The Boeing Company 747-287 Description of Type Design Change: Replacement of three (3) Litton LTN-72/72R INSs with three (3) LTN-92 INSs which consist of part no.4693001-0200-0411 for the INU, part no. 452100-02-03 for MSU and part no. 458900-07 for the CDU in accordance with FAA approved Litton Top Installation Drawing 454065-09, Revision N/C, dated June 11, 1994, or later FAA approved revision of this drawing.

Litton Airplane Flight Manual Supplement Doc.No. 464427, N/C, FAA approved on August 8, 1994, or later FAA approved revision is required as part of this installation.

Limitations and Conditions: This approval is limited to Boeing 747-287 model airplanes, and it applies only when three (3) Litton LTN-92 INSs have been used to replace an existing triple LTN-72/72R INS installation which is FAA approved by Boeing Type Design Data. 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 previously approved modifications will introduce no adverse effect upon the aircraft’s airworthiness. 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 : June 9, 1994

Date of issuance : August 30, 1994

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/sha256/37/f6/37f693106c8274f4e0ab284102bc2ea5ba95897da4736c9ab75bd17f3376c725)

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