SA01528CH
Installation of Walter M601E-11 model turbine engine and an AVIA Propeller Limited VJ8.510 or VJ8.510AG propeller system or Hartzell HC-B3TW-3/T10282NS+4 model propeller. Held by Turbine Conversions LTD, which holds 33 approved modifications in all. Last revised September 10, 2001. 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.; Air Tractor Inc.; Air Tractor Inc.
- Models
- AT-401B, AT-401, AT-402B, AT-402, AT-401A, AT-402A, AT-400A, AT-400
- Type certificates
- A17SW, A17SW, A17SW, A17SW, A17SW, A17SW, A9SW, A9SW
- On this site
- Air Tractor Inc AT-400 49 registered
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 20, 2026.