# STC SA1757NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Aviation Technical Services, United States
- Description: Installation of Dual Litton Model 72 Inertial Navigation Systems
- Applied: July 21, 1982
- Status date: October 24, 2018
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A3WE](https://openairdocs.org/tcds/A3WE)
- Certificate PDF: https://openairdocs.org/files/sha256/75/d9/75d9bbcc8936bb81ee0a5bb3c37eae8f956238f2e7af07b69f23e6ae7be194b0
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A642EF30466C327486258335004DC6DB.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA1757NM

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 727-200 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE))

## 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.

Un ited S tates of Am erica Department of Transportation - Federal Aviation Administration Supplemental Type Certificate

Number SA1757NM

This certificate, issued to Aviation Technical Services 3121 109th Street SW Everett, WA 98204-3500

Part 4b of the Civil Air Regulations.

Original ProductType Certificate Number: A3WE Make: Boeing Model: 727-200

Description of the Type Design Change: Installation of Dual Litton Model 72 Inertial Navigation Systems in accordance with the attached FAA Sealed Drawing TRAMCO 82-082.

Limitations and Conditions: This change in type design applies only to Boeing Model 727-200 aircraft. This type design change should not be extended to other specific models of these airplanes on which other previously approved modifications are incorporated, unless it is determined by the interrelationship between this change and any of those other previously approve modifications will introduce no adverse effect on the airworthiness of that airplane.

Date of application: July 21, 1982 Date reissued: October 24, 2018 Date of issuance: November 18, 1982 Date amended:

FAA FORM 8110-2 (5/14) PAGE 1 OF 2 PAGES By direction of the Administrator

(Signature)

Manager, Seattle ACO Branch (Title)

## Every issue (1)

- October 24, 2018: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/75/d9/75d9bbcc8936bb81ee0a5bb3c37eae8f956238f2e7af07b69f23e6ae7be194b0)

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