# STC SA1829SO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Airwolf Filter Corporation, United States
- Description: Conversion of the instrument air pressure system from positive to vacuum pressure. Only applies to certain serial numbers.
- Applied: May 10, 1985
- 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/d8/d6/d8d6701fa738fa16a06a3f198112c843583dc69c635015b4cfa24228d9851ae3
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D15F56A67DDAC51E86258218005558EF.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA1829SO

## ADs that name it (0)

None.

## Approved models (8)

- Raytheon Aircraft Company 36 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company A36 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company A36TC ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company B36TC ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company F33A ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company F33C ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company V35A ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Raytheon Aircraft Company V35B ([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.

25 Federal Aviation

Modification to convert the instrument air pressure system from positive pressure to vacuum pressure in accordance with Lowe Aviation Company Instructions dated August 9, 1985, or later FAA approved revisions.

This approval should not be extended to other aircraft of this model 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 that airplane. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other pers on written evidence of that permission. FAA Approved Airplane Flight Manual Supplement dated August 22, 1985, is a required part of this STC .

Airwolf Filter, Corp.

12801 Hwy 75 North Okmulgee, OK 74447 3A15 Beech Certain S/N’s of 36, A36, A36TC, B36TC, V35A, V35B, F33A and F33C. See Lowe Aviation Instructions.

May 10, 1985

August 22, 1985

May 6, 2004; 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 (2)

- December 20, 2017: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/d8/d6/d8d6701fa738fa16a06a3f198112c843583dc69c635015b4cfa24228d9851ae3)
- May 6, 2004: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/7f/bd/7fbd6fa9932d5beaee6bbf01caf30a2b7a8f95ae69b0fb03d7960e315460336b)

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