ST04402CH
Installation of Kidde Halotron BrX portable fire extinguishers to replace existing Halon 1211 fire extinguishers. Held by Envoy Aerospace LLC, which holds 25 approved modifications in all. Last revised October 1, 2024. System: emergency equipment.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company
- Models
- 737-900ER Series, 737-700 Series, 737-800 Series, 737-900 Series
- Type certificates
- A16WE, A16WE, A16WE, A16WE
- On this site
- Boeing 737 2,892 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.