SA4-1342
Installation of Winslow Aerofilter Corporation Model 30409A full flow lube oil filter with element 1A0235. Held by Winslow Aerofilter CORP, which holds 57 approved modifications in all. Last revised July 8, 1964. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Cessna Aircraft Company
- Models
- 150 Series
- Type certificate
- 3A19
- On this site
- Cessna 150 7,993 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.