# STC SA2-664

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Signature Flight Support Corporation, United States
- Description: Structural modification to nacelle aft of firewall to eliminate the exhaust trough cut out.
- Applied: October 2, 1958
- Status date: August 31, 2000
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-618](https://openairdocs.org/tcds/A-618), [TCDS A-669](https://openairdocs.org/tcds/A-669)
- Certificate PDF: https://openairdocs.org/files/sha256/d9/30/d93056eef7b1e32f0c03b11c0be07d907f8054b5ba3c8bc89b1b974aaba09bf1
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9217CD4605BFBB1485256CC10083D4C4.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2-664

## ADs that name it (0)

None.

## Approved models (14)

- The Boeing Company DC3-G102 ([TCDS A-618](https://openairdocs.org/tcds/A-618))
- The Boeing Company DC3-G102A ([TCDS A-618](https://openairdocs.org/tcds/A-618))
- The Boeing Company DC3-G103A ([TCDS A-618](https://openairdocs.org/tcds/A-618))
- The Boeing Company DC3-G202A ([TCDS A-618](https://openairdocs.org/tcds/A-618))
- The Boeing Company DC3A-S1C3G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-S1CG ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-S4C4G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-SC3G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-SCG ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- 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))
- The Boeing Company DC3D-R-1830-90C ([TCDS A-669](https://openairdocs.org/tcds/A-669))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number 5A2-664 This certificate issued to: Signature Flight Support Corporation, a Delaware Corporation 7511 Lemmon Avenue, Hangar C Dallas, TX 75209 Certifies that the change in the type design for the following product with the limitation's and conditions therefor as spooified hereon meets the airworthiness requirement's of Part of the Foegulations. Aero Bulletin 7A of the Bureau of Air Commerce Original Product Type Certificate Number : 618, 669 Make: Douglas Model: DC-3 Description of Type Design Change:

Structural modification to nacelle aft of firewall to eliminate the exhaust trough cut out in accordance with data listed on Dallas Aero Service Drawing List titled "Exhaust Trough Rework - DC-3" dated October 2, 1958, or later FAA approved revision.

This is the structural rework only and does not cover the short exhaust stack system.

Compatibility of this modification with other previously approved modifications must be determined by the installer.

Date of Application: . October 02, 1958 Date Reissued: 7/10/92; 12/21/98; 8/31/00 Date of Issuance: September 21, 1960 Date Amended: April 19, 1982 Rev. 5 FEDERAL AVIATION By Direction of the Administrator orit fols. Frances Cox TOMINISTRATO Manager, Special Certification Office, Southwest Region (Title)

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIP code) from (Name of grantor) (Print or type) (Address of grantor) (Number and street) (City, State, and 21P code ) Extent of Authority (if licensing agreement): - Date of Transfer:

Signature of grantor (In ink):

**FAA AC 69-5536**

## Every issue (1)

- August 31, 2000: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/d9/30/d93056eef7b1e32f0c03b11c0be07d907f8054b5ba3c8bc89b1b974aaba09bf1)

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