# STC SA4421NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: GE Engine Services-Corporate Aviation Inc.
DBA Garrett Aviation Services, United States
- Description: Installation of single or dual Global GNS-500A VLF/Omega navigation system and optional Global NDB-2 navigation data bank.
- Applied: January 18, 1982
- Status date: July 20, 2003
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A12EA](https://openairdocs.org/tcds/A12EA)
- Certificate PDF: https://openairdocs.org/files/sha256/6f/e8/6fe89f9727e20c448308d604c748aeb55c1abf72944dfe7aed7460bd5fe008c2
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/66B4C22356F80ED78625750B005AFAA8.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4421NM

## ADs that name it (0)

None.

## Approved models (1)

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

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA4421NM This certificate issued to: GE ENGINE SERVICES-CORPORATE AVIATION, INC

DBA GARRETT AVIATION SERVICES 6201 WEST IMPERIAL HIGHWAY LOS ANGELES, CALIFORNIA 90045 Part *25 of the Federal Aviation Regulations. * (For Certification basis see Type Certificate Data Sheet A12EA) Original Product Type Certificate Number : A12EA Make: Gulfstream American Model: G-1159A Description of Type Design Change: Installation of Single or Dual Global GNS-500A VLF/Omega Navigation System and optional Global NDB-2 Navigation Data Bank in accordance with FAA sealed Western Commander Top Drawing No. 07000013, Revision "B", or later FAA Sealed revision.

FAA approved Western Commander Airplane Flight Manual Supplements required for the various configurations are listed on the Top Drawing.

Limitations and Conditions: The approval of this change in type design applies basically to Gulfstream American G-1159A airplanes only. 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.

A copy of this STC must be included in the permanent records of the modified aircraft.

Date Reissued: December 20, 1994, July 30, 2003 Date of Application: January 18, 1982 Date of Issuance: May 17, 1982 Date Amended: June 3, 1983 FEDERAL AVIATION By Direction of the Administrator Calto K. LJ00 (Signature) Manager, Technical & Administrative Support TOMINISTRATOT Staff, Los Angeles Aircraft Certification Office (Title)

## Every issue (1)

- July 20, 2003: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/6f/e8/6fe89f9727e20c448308d604c748aeb55c1abf72944dfe7aed7460bd5fe008c2)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.