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

ST00346WI

Installation of AlliedSignal (Bendix King) CAS 67 TCAS II Traffic Alert and Collision Avoidance System. Held by Learjet INC., which holds 376 approved modifications in all. Last revised May 25, 1999. System: instruments and avionics.

What it applies to

Kind of product
Aircraft
Design holder
Learjet Inc.
Models
Learjet 31A
Type certificate
A10CE
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.