# STC SA4825NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Northrop Grumman Systems Corporation, United States
- Description: Installation of dual Litton LTN-92 inertial navigation systems.
- Applied: April 21, 1989
- Status date: February 22, 2016
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21, Part 25
- Data sheets: [TCDS A12EA](https://openairdocs.org/tcds/A12EA)
- Certificate PDF: https://openairdocs.org/files/sha256/66/40/664066f6ef4ccf80750121035ad72c5c97ef9309e8477dc061848bed8a278e20
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/092683235BF951AD86257F6B0062440E.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4825NM

## ADs that name it (0)

None.

## Approved models (1)

- Gulfstream Aerospace Corporation G-1159 ([TCDS A12EA](https://openairdocs.org/tcds/A12EA))

## 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. A12EA) Original Product Type Certificate Number :

A12EA

Gulfstream

G-1159 Description of Type Design Change : Installation of dual Litton LTN-92 Inertial Navigation Systems (INS) in accordance with FAA approved sealed Litton Systems, Inc. Installation Drawing No. 454052-09, Revision C dated March 15, 1990, or later FAA approved revision of this drawing.

Litton Systems, Inc. Airplane Flight Manual Supplement, Document No. 464526, Revision A, FAA Approved on March 23, 1990, or later FAA approved revision, is required as part of this installation.

Limitations and Conditions : The approval of this change in type design applies only to the above listed models airplanes. This approval should not be extended to other aircraft of this model on which other approved 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 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 : April 21, 1989

Date of issuance : December 21, 1989

Date reissued : March 30, 2015, February 22, 2016

Date amended : April 4, 1990

(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/sha256/66/40/664066f6ef4ccf80750121035ad72c5c97ef9309e8477dc061848bed8a278e20)
- March 30, 2015: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/f2/b1/f2b142fb5da563edbaf4750fd09c6b66e0ade9ae63d7a51f8fccf83c100d2050)

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