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

SA4633SW

Installation of S-TEC System 60 two axis automatic flight guidance system,Model, ST-080 with optional automatic trim system and with optional flight director steering horizon. Held by S-Tec Corporation, which holds 1,083 approved modifications in all. Last revised March 23, 1982. System: flight controls.

What it applies to

Kind of product
Aircraft
Design holder
Beechcraft Corporation; Beechcraft Corporation
Models
58, 58A
Type certificates
3A16, 3A16
On this site
Beechcraft 58 Baron 1,295 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 19, 2026.