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

SA09544AC-D

Installation of S-TEC 01304 Digital Flight Control System (DFCS). Held by S-Tec Corporation, which holds 1,083 approved modifications in all. Last revised January 3, 2008. System: flight controls.

What it applies to

Kind of product
Aircraft
Design holder
Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company
Models
65-90, 65-A90, 65-A90-1, 65-A90-4, B90, C90, C90A, C90GT, E90, H90
Type certificates
3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20
On this site
Beechcraft 65 201 registered
Beechcraft C90 King Air C90 607 registered
Beechcraft E-90 King Air E90 146 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.