SA03439CH
Installation of a Hartzell Propeller model .HC-B4TN-3C/T10702NS (4 Blade). Held by Aero Innovations LLC, which holds 6 approved modifications in all. Last revised March 31, 2015. System: propeller.
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.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.
- Models
- AT-402, AT-402B, AT-502, AT-502B, AT-503A, AT-504, S2R-T15, S2R-T34, S2RHG-T34
- Type certificates
- A17SW, A17SW, A17SW, A17SW, A17SW, A17SW, A4SW, A4SW, A4SW
- On this site
- Air Tractor Inc AT-402 160 registered
Air Tractor Inc AT-502 501 registered
Air Tractor Inc AT-504 9 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 21, 2026.