# STC SA1607GL

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Airwolf Filter Corp, United States
- Description: Installation of Sky-Tractor Model200 Scavenge oil filter system.
- Applied: October 30, 1990
- Status date: May 1, 2018
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A17SW](https://openairdocs.org/tcds/A17SW)
- Certificate PDF: https://openairdocs.org/files/sha256/5b/2a/5b2a6f245f21f7f1ca1ea97fcac03fe4451d30e01a1ca3e267474ceef437a11c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C2822B68BC20C7FC8625829F004B0860.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1607GL

## ADs that name it (0)

None.

## Approved models (2)

- Air Tractor Inc. AT-401 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-501 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))

## 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.

21 Federal Aviation (See Type Certificate Data Sheet No. A17SW for complete certification basis)

Installation of Sky-Tractor Model 200 Scavenge Oil Filter System in Air-Tractor Model AT-401 and AT-501 Aircraft with Pratt & Whitney Model R1340 Engines in accordance with Sky-Tractor Supply Company Drawing No. 200-G, Revision B, dated October 18, 1990, and Model 200 Scavenge Oil Filter Installation Instructions, no revision, dated April 18, 1983, or later FA A approved revisions.

1. Approval of this change in type design applies to the above aircraft only. This approval should not be extended to other aircraft 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 other previously approved modifications will introduce no adverse effect upon the airworthiness of these aircraft.

2. A copy of this certificate shall be maintained as part of the permanent records for the modified aircraft. Maintain filter in accordance with Sky Tractor Supply Spin On Oil Filter Kit Maintenance Instructions, no revision, dated November 29, 1990, or later FAA approved revisions

Airwolf Filter Corp.

12801 Hwy 75 North Okmulgee, OK 74447 A17SW Air Tractor AT-401, AT-501 October 30, 1990

May 29, 1991

March 9, 2018; May 1, 2018

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

(Title)

## Every issue (2)

- May 1, 2018: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/5b/2a/5b2a6f245f21f7f1ca1ea97fcac03fe4451d30e01a1ca3e267474ceef437a11c)
- March 9, 2018: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/7d/df/7ddfc5e79be5c4d602fdded870d4decda711f2ea4192d4aa539fe6ef8a8d6870)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.