# STC SA4-529

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Vanaero Company, United States
- Description: Short engine exhaust stacks and modified nacelle and exhaust shroud on aircraft equipped with Wright R-2600-29 engines.
- Applied: June 17, 1958
- Status date: August 6, 2007
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: TCDS 2-576
- Certificate PDF: https://openairdocs.org/files/sha256/9b/80/9b80724cedd26151cc55f8e920dd54962208b7be59cac939a5e93b49b8014669
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3EDB08B791ADD24186257356005CFC64.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-529

## ADs that name it (0)

None.

## Approved models (2)

- Douglas Aircraft Co. Inc. Army B-23 (TCDS 2-576)
- Douglas Aircraft Co. Inc. Army UC-67 (TCDS 2-576)

## 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.

This certificate reissued to replace certificate reported lost.

This Certificate issued to MIKE KEITHLEY MAILING ADDRESS c/o MGK AERO INC. P. O. BOX 221957 d/b/a VANAERO COMPANY NEWHALL, CA 91322-1957 25620 RYE CANYON ROAD BLDG. A VALENCIA, CALIFORNIA 91355 Part CAR 04 prior to November 9, 1945 of the Civil Air Regulations.

2-576

Douglas

B-23 (UC-67) Description of Type Design Change: Installation of (short) engine exhaust stacks and modified nacelle and exhaust shroud on aircraft equipped with Wright R-2600-29 engines in accordance with Aircraft Technical Service Incorporated Data List Drawing Number 315.

Limitations and Conditions: This approval should not be extended to other specific aircraft of this m odel on which other previously approved m odifications ar e incorporated, unless it is determ ined that the interrelationship between this cha nge and any of those other previ ously approved m odifications will introduce no adverse effect upon the airworthiness of that aircraft. If the holder agrees to perm it another person to use this certificate to alter the product, th e holder shall give the other person written evidence of that permission.

Date of application : June 17, 1958

Date of issuance : June 19, 1958

Date reissued : August 6, 2007

( Signature) Manager, Technical & Administrative Support Staff Los Angeles Aircraft Certification Office ( Title)

## Every issue (1)

- August 6, 2007: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/9b/80/9b80724cedd26151cc55f8e920dd54962208b7be59cac939a5e93b49b8014669)

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