# STC SA3523WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Airwolf Filter Corporation, United States
- Description: Installation of an airfoil separator in the engine breather system.
- Applied: September 9, 1977
- Status date: December 20, 2017
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A15](https://openairdocs.org/tcds/3A15)
- Certificate PDF: https://openairdocs.org/files/sha256/cd/d4/cdd470547a64b07aaa6a3ddf13f9bf4c8d52dbdb3142e075c8101cdd0bb6f81a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/04B7792AD8C5FD248625821800555903.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA3523WE

## ADs that name it (0)

None.

## Approved models (10)

- Raytheon Aircraft Company 35-33 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company 35-A33 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company 35-B33 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company 35-C33 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company H35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company J35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company K35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company M35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company N35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company P35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))

## 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.

3* Civil Air

*Certification basis is set forth on Type Certificate Data Sheet 3A15, Revision 58

Installation of an air/oil separator in the engine breather system in accordance with FAA-sealed Walker Engineering Company Master Drawing List No. DLW-3000, Revision “C”, dated October 25, 1977, or later FAA-approved revisions.

The approval of this change in type design applies basically to the above listed models only. 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 by the installer that the interrelationship between this change and any of those other previously approved modifications will introduce no adverse effect upon the airworthiness of the above listed airplanes. A copy of this STC must be included in the permanent records of the modified aircraft. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

Airwolf Filter, Corp.

12801 Hwy 75 North Okmulgee, OK 74447 3A15 Beech H35, J35, K35, M35, N35, P35, 35-33, 35-A33 35-B33 and 35-C33 September 9, 1977

November 25, 1977

September 28, 2001; December 20, 2017

(Signature) Roy E. Boffo Manager, Propulsion and Project Management Section Chicago ACO Branch

(Title)

Original signed by:

Roy E. Boffo

## Every issue (1)

- December 20, 2017: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/cd/d4/cdd470547a64b07aaa6a3ddf13f9bf4c8d52dbdb3142e075c8101cdd0bb6f81a)

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