SA1196SW

Installation of Mitchell automatic flight system model AK309 consisting of Century I, automatic aileron stabilizer with omni tracker. Held by Century Flight Systems INC, which holds 765 approved modifications in all. Last revised July 9, 1984. System: flight controls.

What it applies to

Kind of product: Aircraft
Design holder: Alexandria Aircraft LLC; Alexandria Aircraft LLC; Alexandria Aircraft LLC; Alexandria Aircraft LLC
Models: 14-19-3A, 17-30, 17-31, 17-31TC
Type certificates: 1A3, 1A3, 1A3, 1A3
On this site: Downer 14 7 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.