SH5690NM
Installation of Advanced Technology Aircraft Co. engine barrier filter. Held by Wsh, LLC, which holds 7 approved modifications in all. Last revised February 5, 2022. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Bell Helicopter Textron Inc.; Bell Helicopter Textron Inc.; International Helicopters Inc.; Overseas Aircraft Support Inc; Richards Heavylift Helo Inc.; Rotorcraft Development Corporation; Rotorcraft Development Corporation; Rotorcraft Development Corporation; San Joaquin Helicopters; Smith Helicopters; West Coast Fabrications
- Models
- 204B, UH-1E, UH-1B, UH-1E, UH-1B, UH-1B, UH-1B, UH-1E, UH-1B, UH-1E, UH-1E
- Type certificates
- H1SW, H4NM, H5SO, H7SO, H3SO, H13WE, H3NM, H5NM, H1RM, H8NM, H9NM
- On this site
- Bell 204 7 registered
Bell UH-1 Huey (Iroquois) 404 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.