SA4735NM
Installation of automatic flagman Model 4 dispensor system on the upper surface of the right wing root. Held by R-S Sales INC., which holds 22 approved modifications in all. Last revised August 27, 2001. 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.; Air Tractor Inc.
- Models
- AT-401, AT-501, AT-502, AT-503, AT-503A, AT-402A, AT-402
- Type certificates
- A17SW, A17SW, A17SW, A17SW, A17SW, A17SW, A17SW
- On this site
- Air Tractor Inc AT-401 68 registered
Air Tractor Inc AT-402 160 registered
Air Tractor Inc AT-502 502 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.