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

SA223GL

The installation of the stall strips. Held by Mackenzie Aviation CO. Last revised April 24, 1979. System: other and general.

What it applies to

Kind of product
Aircraft
Design holder
The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company
Models
150, 150H, A150L, A150K, 150K, 150J, 150G, 150F, 150E, 150D, 150C, 150A, 152, 150B, A150M, A152, 150M, 150L
Type certificates
3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 3A19, 3A19
On this site
Cessna 150 7,993 registered
Cessna 152 1,637 registered
Cessna A150 232 registered
Cessna A152 48 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 22, 2026.