SH431NW
Installation of Simplex Manufacturing Company Model 500 spray system. Held by Simplex Manufacturing CO, which holds 31 approved modifications in all. Last revised April 29, 1983. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- MD Helicopter Inc.; MD Helicopter Inc.
- Models
- 369D, 369H
- Type certificates
- H3WE, H3WE
- On this site
- Md Helicopters Llc 369 34 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.