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

SA7BO

Installation of a Teledyne Continental A-65 engine and motor mount, Sensenich M74CK propeller, engine cowl and nose bowl, instrument panel and instruments and rudder gap seals. Held by Stephenson John W, which holds 2 approved modifications in all. Last revised August 31, 1993. System: propeller.

What it applies to

Kind of product
Aircraft
Design holder
Taylorcraft Inc.
Models
A
Type certificate
A-643
On this site
Taylorcraft A 28 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 7, 2026.