SA6037SW-D

Installation of S-TEC System 40/50, single and two axis automatic flight guidance system, Model ST-298-40/50. Held by S-Tec Corporation, which holds 1,083 approved modifications in all. Last revised March 3, 2008. 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
Models: 152, A152, 150M, A150L, 150L, A150K, 150K, 150J, 150H, 150G, A150M
Type certificates: 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 5, 2026.