SA00198SE
Fabrication and installation of vortex generators and 'delta wings' mounted on the wings and strakes mounted above the left- and right-hand wing/ fuselage junctions. Held by Aeronautical Testing Service INC., which holds 23 approved modifications in all. Last revised May 22, 1997. System: airframe structure.
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.
- Models
- AT-401, AT-401A, AT-401B, AT-402, AT-402A, AT-402B
- Type certificates
- A17SW, A17SW, A17SW, A17SW, A17SW, A17SW
- On this site
- Air Tractor Inc AT-401 68 registered
Air Tractor Inc AT-402 160 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 21, 2026.