SH4331NM
Installing a Model 7700 Modular Electrical System. Held by Simplex Manufacturing Company, which holds 60 approved modifications in all. Last revised July 8, 1988. System: electrical power.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Bell Helicopter Textron; Bell Helicopter Textron; Bell Helicopter Textron; Bell Helicopter Textron; Bell Helicopter Textron; Bell Helicopter Textron; Bell Helicopter Textron
- Models
- 214ST, 205A-1, 205A, 204B, 212, 214B, 214B-1
- Type certificates
- H10SW, H1SW, H1SW, H1SW, H4SW, H6SW, H6SW
- On this site
- Bell 204 7 registered
Bell 205 58 registered
Bell 212 59 registered
Bell 214 31 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.