SA271NW
Modify air induction system to engine by removing filter assembly and reinstalling filter wire mesh screen. Held by Kenmore Air Harbor INC, which holds 34 approved modifications in all. Last revised April 5, 2019. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company
- Models
- 172, 185, 180
- Type certificates
- 3A12, 3A24, 5A6
- On this site
- Cessna 172 Skyhawk 20,669 registered
Cessna 180 Skywagon 2,606 registered
Cessna 185 Skywagon 227 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 5, 2026.