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

SA00403DE

Installation of Puritan Bennett Sweep On 2000 Crew Oxygen Masks. Held by West Star Aviation, which holds 63 approved modifications in all. Last revised December 6, 1999. System: emergency equipment.

What it applies to

Kind of product
Aircraft
Design holder
Cessna Aircraft Company
Models
525
Type certificate
A1WI
On this site
Cessna 525 CitationJet (CJ series) 1,967 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 8, 2026.