SR00931SE
Fabrication of Simplex Model 314 Fire Attack System. Held by Simplex Manufacturing Company, which holds 60 approved modifications in all. Last revised May 15, 2012. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Evergreen Helicopters Inc.; Helicopter Transport Services Inc.; Helicopter Transport Services LLC; Siller Helicopters LLC
- Models
- CH-54A, CH-54B, CH-54A, CH-54A
- Type certificates
- R00009SE, H14NM, H16NM, H18NM
- On this site
- Helicopter Transport Services CH-54 5 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.