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

SA02940CH

Installation of Air Data Equipment Modifications in accordance with West Star Aviation, Inc. Master Data List, Document No. 70-334L002, Revision A, dated November 18, 2011, or later FAA approved revision. Held by West Star Aviation INC, which holds 37 approved modifications in all. Last revised November 21, 2011. System: instruments and avionics.

What it applies to

Kind of product
Aircraft
Design holder
Cessna Aircraft Company
Models
441
Type certificate
A28CE
On this site
Cessna 441 Conquest II 172 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 5, 2026.