What it approves
Installation of Sky-Tractor model 500 scavenge oil filter system with P&W model R-985 engines.
What the certificate says
From the PDF’s text layer, without the form’s printed wording. Layout and order may differ; the PDF is the record.
8 Civil Air (See Type Certificate Data Sheet No. AR-33 for complete certification basis)
Installation of Sky-Tractor Model 500 Scavenge Oil Filter System in DeHavilland Model L-20A Aircraft with Pratt & Whitney Model R-985 Engines in accordance with Sky-Tractor Supply Company Drawing No. 500-G, no revision, dated October 18, 1990, and Model 500 Scavenge Oil Filter Installation Instructions, no revision, dated October 18, 1990, or later FAA approved revis ions of these documents.
1. Approval of this change in type design applies to the above aircraft only. This approval should not be extended to other aircraft 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 AR-33 DeHavilland L-20A October 17, 1990
October 21, 1991
March 9, 2018; May 1, 2018
(Signature) Roy E. Boffo Manager, Propulsion and Project Management Section Chicago ACO Branch
(Title)
ADs that name this STC · 0
An AD can apply because an STC is installed, or mention one in its text.
Approved models · 1
| Make | Model | Data sheet |
|---|---|---|
| de Havilland Inc. (Canada) | L-20A | AR-33 |
Every issue · 2
DRS keeps each issue of an STC as its own record, with its own certificate and attachments.
| Date | Status | Files |
|---|---|---|
| May 1, 2018 | Reissued, current | Certificate |
| March 9, 2018 | Reissued, earlier issue | Certificate |