SR01400NY

Installation of Alpine Aerotech Ltd. exhaust duct. Held by Alpine Aerotech Limited (Canada), which holds 5 approved modifications in all. Last revised October 17, 2001. System: engine.

What it applies to

Kind of product: Aircraft
Design holder: Bell Helicopter Textron; Bell Helicopter Textron; Bell Helicopter Textron; Bell Helicopter Textron
Models: 412, 412EP, 212, 412CF
Type certificates: H4SW, H4SW, H4SW, H4SW
On this site: Bell 212 59 registered
Bell 412 87 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.