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

SA03040CH

Installation of a digital payload hopper quantity and spray boom pressure indicating system. Held by Reabe Design LLC, which holds 5 approved modifications in all. Last revised February 1, 2026. System: other and general.

What it applies to

Kind of product
Aircraft
Design holder
Air Tractor Inc.; Air Tractor Inc.; Air Tractor Inc.; Air Tractor Inc.; Air Tractor Inc.; Air Tractor Inc.; Air Tractor Inc.; Air Tractor Inc.; Air Tractor Inc.; Air Tractor Inc.; Air Tractor Inc.; Air Tractor Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.
Models
AT-400, AT-400A, AT-402, AT-402A, AT-402B, AT-502, AT-502A, AT-502B, AT-504, AT-602, AT-802, AT-802A, S2R-G1, S2R-G10, S2R-G5, S2R-G6, S2R-H80, S2R-T11, S2R-T15, S2R-T34, S2R-T45, S2R-T65, S2R-T660, S2R, S2RHG-T34, S2RHG-T65
Type certificates
A9SW, A9SW, A17SW, A17SW, A17SW, A17SW, A17SW, A17SW, A17SW, A19SW, A19SW, A19SW, A4SW, A4SW, A4SW, A4SW, A4SW, A4SW, A4SW, A4SW, A4SW, A4SW, A4SW, A4SW, A4SW, A4SW
On this site
Air Tractor Inc AT-400 49 registered
Air Tractor Inc AT-402 160 registered
Air Tractor Inc AT-502 502 registered
Air Tractor Inc AT-504 9 registered
Air Tractor Inc AT-602 246 registered
Air Tractor Inc AT-802 684 registered
Ayres Corporation S-2 244 registered
Thrush Aircraft Inc S-2 102 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.