# STC SA4-492

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: FTG, Inc., United States
- Description: Installation of VIP P/N's 104-1-B and 104-1-C engine mount cores.
- Applied: April 16, 1958
- Status date: May 13, 2022
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-762](https://openairdocs.org/tcds/A-762)
- Certificate PDF: https://openairdocs.org/files/sha256/fd/80/fd80cc2b31bc5b218904eabdc969951ff35b6acf1dee5b642aab8e755d58510f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID189388187820230110163511.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-492

## ADs that name it (0)

None.

## Approved models (2)

- The Boeing Company C54-DC ([TCDS A-762](https://openairdocs.org/tcds/A-762))
- The Boeing Company DC-4 ([TCDS A-762](https://openairdocs.org/tcds/A-762))

## 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.

United States of America Department of Transportation - Federal Aviation Administration Supplemental Type Certificate Number: SA4-492 This certificate may be transferred or made available to third persons by licensing agreements in accordance with 14 CFR 21. 47.

FAA Form 8110-2 (4/22) SUPERSEDES PREVIOUS EDITION Page 1 of 2

Part 4a&4b of the Federal Aviation Regulations.

dated November 1, 1943 & November 9, 1945

Description of Type Design Change: Installation of VIP P/N's 104-1-B and 104-1-C engine mount cores (Replacing P&W Part No. 41275 and Lord Part No. MR- 26-1 and are equivalent to and interchangeable with P&W Part No. 70639 and Lord Part No. MR-26-1B engine mount cores) on aircraft equipped with Pratt & Whitney R-2000 series engines.

Limitations and Conditions: This approval should not be extended to other specific airplanes of these models on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any of these other previously approved modifications will introduce no adverse effects upon the airworthiness of that airplane.

Date of Application: April 16, 1958 Date Reissued: Aug. 15, 1986; Sept. 16, 1986; May 13, 2022 Date of Issuance: May 16, 1958 Date Amended: September 11, 1962;

Title: Aviation Safety Acting Manager, Technical & Administrative Support Section, Los Angeles ACO Branch

This certificate issued to: FTG, Inc.

12750 Center Court Drive S Suite 280 Cerritos, CA 90703 Original Product Type Certificate Number: A-762 Make: The Boeing Company Model: DC-4, C54-DC Series

United States of America Department of Transportation - Federal Aviation Administration Supplemental Type Certificate Number: SA4-492 This certificate may be transferred or made available to third persons by licensing agreements in accordance with 14 CFR 21. 47.

FAA Form 8110-2 (4/22) SUPERSEDES PREVIOUS EDITION Page 2 of 2

## Every issue (1)

- May 13, 2022: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/fd/80/fd80cc2b31bc5b218904eabdc969951ff35b6acf1dee5b642aab8e755d58510f)

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