# STC SA2253NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: GE Engine Services-Corporate Aviation Inc.
DBA Garrett Aviation Services, United States
- Description: Installation of Sperry Air Data computers with optional VNAV controller.
- Applied: November 1, 1983
- Status date: July 30, 2003
- 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/sha256/4d/5c/4d5c79d1a667385b93b8b30593f4d522336530cadad927037b3528dce4268e6c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/24894B3250ED29B28625712600529557.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2253NM

## ADs that name it (0)

None.

## Approved models (2)

- Gulfstream Aerospace Corporation G-1159 ([TCDS A12EA](https://openairdocs.org/tcds/A12EA))
- Gulfstream Aerospace Corporation G-1159A ([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 GE ENGINE SERVICES - CORPORATE AVIATION, INC.

DBA GARRETT AVIATION SERVICES 6201 WEST IMPERIAL HIGHWAY LOS ANGELES, CA 90045 Part 25/4b of the Regulations.

(Certification basis see Type Certificate Data Sheet A12EA) Original Product Type Certificate Number:

A12EA Gulfstream Aerospace Corp.

G-1159 (without tip tanks) and G-1159A

Description of Type Design Change: Installation of Sperry Air Data Computers with Optional VNAV Controller in accordance with FAA sealed Western Commander Top Drawing No. 07000028 Revision N/C or later FAA sealed revision. Applicable FAA approved Western Commander Airplane Flight Manual Supplements are listed on the appropriate Western Commander Top Drawing.

Limitations and Conditions: The approval of this change in type design applies basically to the listed model 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 of application : November 1, 1983

Date of issuance: March 29, 1984

Date reissued: December 20, 1994, July 30, 2003

Date amended: July 5, 1984, September 17, 1986

( Signature) Manager, Technical & Administrative Support Staff, Los Angeles Aircraft Certification Office

(Title)

## Every issue (1)

- July 30, 2003: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/4d/5c/4d5c79d1a667385b93b8b30593f4d522336530cadad927037b3528dce4268e6c)

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