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

SA1634SW

Installation of Mitchell AK423 consisting of 1C707 omni/localizer converter. Held by Century Flight Systems INC, which holds 765 approved modifications in all. Last revised July 16, 1984. System: other and general.

What it applies to

Kind of product
Aircraft
Design holder
Beechcraft Corporation; Beechcraft Corporation
Models
36, A36
Type certificates
3A15, 3A15
On this site
Beechcraft 36 Bonanza 111 registered
Beechcraft A36 Bonanza 2,530 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.