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

SA3489SW-D

Installation of a Century automatic flight system model AK996 consisting of a Century 2010/2030/2031/2050/2051 autopilot. Held by Century Flight Systems INC, which holds 765 approved modifications in all. Last revised March 31, 1997. System: flight controls.

What it applies to

Kind of product
Aircraft
Design holder
Beechcraft Corporation; Beechcraft Corporation; Beechcraft Corporation; Beechcraft Corporation; Beechcraft Corporation; Beechcraft Corporation; Beechcraft Corporation; Beechcraft Corporation; Beechcraft Corporation; Beechcraft Corporation; Beechcraft Corporation; Beechcraft Corporation
Models
35-33, 35-A33, 35-B33, 35-C33, 35-C33A, E33, E33A, E33C, F33, F33A, F33C, G33
Type certificates
3A15, 3A15, 3A15, 3A15, 3A15, 3A15, 3A15, 3A15, 3A15, 3A15, 3A15, 3A15
On this site
Beechcraft 35 Bonanza and Debonair 1,077 registered
Beechcraft E33 135 registered
Beechcraft F33 Bonanza 1,008 registered
Beechcraft G33 41 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.