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

SA01053SE

Fabrication of Ag-Air Systems Model YD61600 Auxiliary Hydraulic System. Held by Kawak Aviation Technologies INC, which holds 12 approved modifications in all. Last revised August 10, 2006. System: heating, ice protection and utility systems.

What it applies to

Kind of product
Aircraft
Design holder
Air Tractor Inc.; Air Tractor Inc.
Models
AT-802, AT-802A
Type certificates
A19SW, A19SW
On this site
Air Tractor Inc AT-802 684 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.