The U.S. aircraft register, updated daily
Approved modifications · supplemental type certificate · current · reissued

ST04406CH

Installation of ADS-B qualified transponders and new Integrated Multi-Mode Receivers (IMMRs) on Boeing 737 aircraft with Canard Aerospace Corporation (CAC) Document Control Drawing 40218, Rev N, dated March 08, 2021, or later FAA approved revision. Held by Canard Aerospace Corporation, which holds 67 approved modifications in all. Last revised January 11, 2022. System: instruments and avionics.

What it applies to

Kind of product
Aircraft
Design holder
The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company
Models
737-600 Series, 737-700 Series, 737-700C Series, 737-800 Series, 737-900 Series, 737-900ER Series
Type certificates
A16WE, A16WE, 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.