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

SA3522SW

Removal of the three degree offset from the vertical stabilizer, addition of the airfoil shape to the top of the horizontal stabilizer, and move of the turbine aft by 13 inches in accordance with Drawing Numbers 7061, 7062, 7063, and Drawing List No. 70001 revised 10/10/85. Held by Turbine Conversions LTD, which holds 33 approved modifications in all. Last revised May 10, 2011. System: engine.

What it applies to

Kind of product
Aircraft
Design holder
Allied Ag Cat Productions Inc.
Models
G-164C
Type certificate
1A16
On this site
Ag-Cat Corporation G-164 5 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.