# STC ST746SO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Tradewinds Aircraft Supply, Inc.
- Description: Installation of short engine exhaust stacks.
- Status date: April 7, 1989
- Data sheets: A-669, A-669, A-669, A-669, A-669, A-669, A-669, A-669, A-669, A-669
- Certificate PDF: https://openairdocs.org/files/sha256/a9/11/a911e157354a2ee98d71b1bf33c3deac37fc330fe0561a8149b71468f0d9b9ea
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/01C181568D7DEC8585256CC300037495.0001
- Page: https://openairdocs.org/stc/ST746SO

## ADs that name it

None.

## Approved models (10)

- The Boeing Company DC3A-S1C3G (TCDS A-669)
- The Boeing Company DC3A-S1CG (TCDS A-669)
- The Boeing Company DC3A-S4C4G (TCDS A-669)
- The Boeing Company DC3A-SC3G (TCDS A-669)
- The Boeing Company DC3A-SCG (TCDS A-669)
- The Boeing Company DC3C-R-1830-90C (TCDS A-669)
- The Boeing Company DC3C-S1C3G (TCDS A-669)
- The Boeing Company DC3C-S4C4G (TCDS A-669)
- The Boeing Company DC3C-SC3G (TCDS A-669)
- The Boeing Company DC3D-R-1830-90C (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.

United States of amenta Bepartrnent of transportation —iederal aviation administration oipplemental t^pe Certificate isKwm<v€41' ST746SO Tradewinds Aircraft Supply, Inc 11550 North Loop Road San Antonio, Texas 78216 ^ : 669 . McDonnell Douglas i&J: DC- 3 Series Installation of short engine exhaust stacks in accordance with R.W.D Inc. Drawing Number RWD 7401 Change A.

This installation eligible only on DC-3 series airplanes equipped with P&W R-1830 engines and Douglas P/N 5115224 exhaust collector rings. Airworthiness compatibility of this STC with all other major changes to the standard original model(s) shown above should be confirmed prior to installation of this STC.

//J^/<^^ September 20, 1974 -A^~^~/. April 7, 1989 January 8, 1975 tager, A^Tan't»/Aircraft Certification Office

'Ihis ctrtificate may be Iransjrrrfd in accurdatu'e with FAR 21.•//.

**FAAFOIM 81 10-2(10-68)**

INSTRUCTIONS : The transfer endorsement below may be used to notify the appropriate FAA Regional Office of the transfer of this Supplemental Type Certificate.

The FAA will reissue the certificate In the name of the transferre and forward it to him.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (9{ame of transferee.)

(Address of transferee) (9{um6er ami street) (City, State, mdZlf ux{e) from(%(ame of grantor) (Print or type) _ (Address of grantor) ___ (Stonier ami street) (City, State, andZlf code) Exent of Authority (if licensing agreement) :

Signature of grantor (In Page 2 of 2

## Every issue (1)

- April 7, 1989: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/a9/11/a911e157354a2ee98d71b1bf33c3deac37fc330fe0561a8149b71468f0d9b9ea)

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