# STC SA4787NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Aviation Technical Services, United States
- Description: Reactivation of door number 3 left and right. (747-206B)
- Applied: October 5, 1989
- Status date: October 24, 2018
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21, Part 25
- Data sheets: [TCDS A20WE](https://openairdocs.org/tcds/A20WE)
- Certificate PDF: https://openairdocs.org/files/sha256/3f/2a/3f2a92c7a0dd6c7d646125b17235d5ccffa97579527e149fc361fb51831f78c2
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4F34210A18EBFDF786258335004C07F8.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA4787NM

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 747 ([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.

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

Number SA4787NM

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

Part 25 of the Federal Aviation Regulations. (See Type Certification Data Sheet A20WE for complete certification basis)

Original ProductType Certificate Number: A20WE Make: Boeing Model: 747-206B

Description of the Type Design Change: Reactivation of door number 3 left and right in accordance with Tramco Inc. Engineering Order Number 52-11-747-001, Revision C, dated October 31, 1989 and ECN’s 1 and 2 dated November 7, 1989.

Limitations and Conditions: The approval of this change in type design applies to the reactivation of door 3 left and right but does not include the exterior exit band marking or the resulting interior arrangement at door 3. This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate must be maintained as part of the permanent records for the modified aircraft.

Date of application: October 6, 1989 Date reissued: October 24, 2018 Date of issuance: November 14, 1989 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 (2)

- October 24, 2018: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/3f/2a/3f2a92c7a0dd6c7d646125b17235d5ccffa97579527e149fc361fb51831f78c2)
- November 14, 1989: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/a6/36/a6362aa349cd5d634a2e85f1d8b73aa14913096d0b7b4f39f025a2d7d60caf0b)

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