# STC SA7529SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Greenwich Aircraft Corporation, United States
- Description: Removal of lead ballast from front and aft faces of original firewalls.
- Applied: October 27, 1988
- Status date: March 31, 2020
- Product: Aircraft, Large Airplane
- Certification basis: Part 21, Part 25
- Data sheets: [TCDS A-669](https://openairdocs.org/tcds/A-669)
- Certificate PDF: https://openairdocs.org/files/sha256/21/be/21be731d4c00bf47b5109daa27ef26b84b6bd8997fb05574bd94f02335fe564d
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8788E28F0B4115DA8625871A005CD1CB.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA7529SW

## ADs that name it (0)

None.

## Approved models (4)

- The Boeing Company DC3C-R-1830-90C ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3C-S1C3G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3C-S4C4G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3C-SC3G ([TCDS A-669](https://openairdocs.org/tcds/A-669))

## 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.

FAA Form 8110-2 (7/19) Page 1 of 3

Number: SA7529SW

Parts 4b of the Civil Aviation Regulations and FAR Part

25.

Original Product – Type Certificate Number: A-669 Make: McDonnell Douglas Model: DC3C-SC3G, -S1C3G, -S4C4G, -R-1830-90C

Removal of lead ballast from front and aft faces of the original engine firewalls in accordance with the data listed on the continuation sheet.

STC SA3820SW must also be installed. Airplane Flight Manual Supplement dated December 15, 1989, is required. This STC is limited to airplane serial number 27085 only. Compatibility of this modification with previously installed equipment must be determined by installer.

Date of Application: October 27, 1988 Date Reissued: 07/23/93; 9/15/93; 01/24/2020; 03/31/2020 Date of Issuance: December 15, 1988 Date Amended:

Signature

Title Jim Grigg Manager, Fort Worth A CO Branch, Compliance & Airworthiness Division Aircraft Certification Service Greenwich Aircraft Corporation 619 Van Buren Avenue Oxford, MS 38655

FAA Form 8110-2 (7/19) Page 3 of 3

FAA Form 8110-2 (7/19) Page 3 of 3

Transfer the ownership of Supplemental Type Certificate Number: SA7529SW

To (Name and address of transferee)

From (Name and address of grantor)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA7529SW

FAA Form 8110-2 (7/19) Page 3 of 3

Date of Issuance: December 15, 1988 Date of Reissuance: March 31, 2020

Description of Type Design Change (Continued):

Schafer Aircraft Modifications, Inc. Engineering Orders:

Drawing No. Revision E.O.

11-10-01 A B-1, B-2 11-10-02 A B-1 11-10-03 IR A-1 11-10-08 IR A-1 11-20-00 IR A-1 31-30-01 A B-1 31-40-00 A B-1 71-40-00

E.O. dated 11/15/88 as amended by item two of FAA Form 8100-1 for TIA SW-190-1044 Revision 1 dated December 9, 1988.

-END-

## Every issue (2)

- March 31, 2020: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/21/be/21be731d4c00bf47b5109daa27ef26b84b6bd8997fb05574bd94f02335fe564d)
- September 15, 1993: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/ef/80/ef80d2f3dc1ac73faca4bcce2aad11f777eb9abeed26ff036a52455954ad205b)

---
From OpenAirDocs.org, an independent open copy of FAA and NTSB data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.