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

SA1940CE

Installation of Safe Flight Inst. Corp. speed command of attitude and thrust and wind shear system(SCAT/WS), performance command system (PCS), thrust management system (TMS), angle of attack(AOA) system, wind shear (WS) system, and various combinations of the SCAT/WS, PCS, and TMS systems with an autopower system. Held by Safe Flight Instrument CORP, which holds 22 approved modifications in all. Last revised October 14, 1986. System: instruments and avionics.

What it applies to

Kind of product
Aircraft
Design holder
The Cessna Aircraft Company
Models
550
Type certificate
A22CE
On this site
Cessna 550 Citation II 500 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.