SA557NW
Installation of a Janitrol Heater, Model B4050 (Pkg 11E78-1). Held by Sorm Industries, which holds 11 approved modifications in all. Last revised January 17, 1978. System: heating, ice protection and utility systems.
What it applies to
- Kind of product
- Aircraft
- Design holder
- B-N Group Ltd.
- Models
- BN-2A-8
- Type certificate
- A17EU
- On this site
- Britten-Norman BN-2 54 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.