SA3687WE

Installation of an air/oil separator. Held by Airwolf Filter Corporation, which holds 61 approved modifications in all. Last revised December 20, 2017. System: other and general.

What it applies to

Kind of product: Aircraft
Design holder: The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.
Models: 150G, 150K, 150H, 150F, 150E, 150D, 150C, 150L, 150J, PA-28R-200, PA-28S-180, PA-28R-180, PA-28S-160, PA-28-180, PA-28-160, PA-28-151, PA-28-140, PA-28-150
Type certificates: 3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 2A13, 2A13, 2A13, 2A13, 2A13, 2A13, 2A13, 2A13, 2A13
On this site: Cessna 150 7,993 registered
Piper PA-28 Cherokee, Warrior, Archer and Arrow 18,636 registered
The FAA's record: On the FAA's site

What an approved modification is

A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.

Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 20, 2026.