The U.S. aircraft register, updated daily
Approved modifications · supplemental type certificate · current · amended

SA3481SW-D

Installation of Century Automatic Flight System, Model AK988 consisting of a Century 2110/2130/2131/2150/2151 autopilot. Held by Century Flight Systems INC, which holds 765 approved modifications in all. Last revised November 3, 2000. System: flight controls.

What it applies to

Kind of product
Aircraft
Design holder
Cessna Aircraft Company
Models
182Q
Type certificate
3A13
On this site
Cessna 182 Skylane 11,828 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.