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

ST04514AT

Installation of the Nose Wheel Steering Control Module Enclosure Kit and Spill Sleeve Shaft Housing. Held by Professional Aircraft Accessories INC.. Last revised March 1, 2021. System: landing gear.

What it applies to

Kind of product
Aircraft
Design holder
MHI RJ Aviation ULC
Models
CL-600-2B19 (Regional Jet Series 100)
Type certificate
A21EA-1
On this site
Bombardier CL-600 Challenger and CRJ 1,656 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 9, 2026.